Nick's Space / Astronomy Blog

"Barbara has served NASA and the Astronaut Office with distinction over the course of her career," Astronaut Office chief Steve Lindsey said. "From the Teacher in Space Program to her current position as a fully qualified astronaut, she has set a superb example and been a consistent role model for both teachers and students. She will be missed."

Morgan previously served as the backup to payload specialist Christa McAuliffe in the Teacher in Space Program. McAuliffe and six fellow astronauts lost their lives in the Challenger accident on Jan. 28, 1986. Morgan, who was an elementary schoolteacher in McCall, Idaho, before being selected as McAuliffe's backup, returned to teaching after the accident. She was selected to train as a mission specialist in 1998 and named to the STS-118 crew in 2002.

"It is really tough to leave NASA," Morgan said. "It is a great organization with great people doing great things. We're going back to the moon and on to Mars. I'm especially proud that we have three other teachers who are astronauts, and there will be others in the future. I'm very excited to go to work for Boise State University. I like everything about it, and it's going to be wonderful helping exploration by working full time for education."

Three other educator mission specialists, Richard Arnold, Joseph Acaba and Dottie Metcalf-Lindenburger, are training for future spaceflights. Arnold and Acaba are assigned to fly on the STS-119 space shuttle mission to the station in 2009.

Morgan will serve as Distinguished Educator in Residence at Boise State, providing vision and leadership to the state of Idaho on science, technology, engineering and math education.

Image Credit: NASA

At around 7:17 on the morning of June 30, 1908, a man based at the trading post at Vanavara in Siberia is sitting on his front porch. In a moment, 40 miles from the center of an immense blast of unknown origin, he will be hurled from his chair and the heat will be so intense he will feel as though his shirt is on fire. The man at the trading post, and others in a largely uninhabited region of Siberia, near the Podkamennaya Tunguska River, are to be accidental eyewitnesses to cosmological history.

"If you want to start a conversation with anyone in the asteroid business all you have to say is Tunguska," said Don Yeomans, manager of the Near-Earth Object Office at NASA's Jet Propulsion Laboratory. "It is the only entry of a large meteoroid we have in the modern era with first-hand accounts."

While the impact occurred in '08, the first scientific expedition to the area would have to wait for 19 years. In 1921, Leonid Kulik, the chief curator for the meteorite collection of the St. Petersburg museum led an expedition to Tunguska. But the harsh conditions of the Siberian outback thwarted his team's attempt to reach the area of the blast. In 1927, a new expedition, again lead by Kulik, reached its goal.

"At first, the locals were reluctant to tell Kulik about the event," said Yeomans. "They believed the blast was a visitation by the god Ogdy, who had cursed the area by smashing trees and killing animals."

While testimonials may have at first been difficult to obtain, there was plenty of evidence lying around. Eight hundred square miles of remote forest had been ripped asunder. Eighty million trees were on their sides, lying in a radial pattern.

"Those trees acted as markers, pointing directly away from the blast's epicenter," said Yeomans. "Later, when the team arrived at ground zero, they found the trees there standing upright -- but their limbs and bark had been stripped away. They looked like a forest of telephone poles."

Such debranching requires fast moving shock waves that break off a tree's branches before the branches can transfer the impact momentum to the tree's stem. Thirty seven years after the Tunguska blast, branchless trees would be found at the site of another massive explosion -- Hiroshima, Japan.

Kulik's expeditions (he traveled to Tunguska on three separate occasions) did finally get some of the locals to talk. One was the man based at the Vanara trading post who witnessed the heat blast as he was launched a few yards. His account:

Suddenly in the north sky… the sky was split in two, and high above the forest the whole northern part of the sky appeared covered with fire… At that moment there was a bang in the sky and a mighty crash… The crash was followed by a noise like stones falling from the sky, or of guns firing. The earth trembled.

The massive explosion packed a wallop. The resulting seismic shockwave registered with sensitive barometers as far away as England. Dense clouds formed over the region at high altitudes which reflected sunlight from beyond the horizon. Night skies glowed, and reports came in that people who lived as far away as Asia could read newspapers outdoors as late as midnight. Locally, hundreds of reindeer, the livelihood of local herders, were killed, but there was no direct evidence that any person perished in the blast.

"A century later some still debate the cause and come up with different scenarios that could have caused the explosion," said Yeomans. "But the generally agreed upon theory is that on the morning of June 30, 1908, a large space rock, about 120 feet across, entered the atmosphere of Siberia and then detonated in the sky."

It is estimated the asteroid entered Earth's atmosphere traveling at a speed of about 33,500 miles per hour. During its quick plunge, the 220-million-pound space rock heated the air surrounding it to 44,500 degrees Fahrenheit. At 7:17 a.m. (local Siberia time), at a height of about 28,000 feet, the combination of pressure and heat caused the asteroid to fragment and annihilate itself, producing a fireball and releasing energy equivalent to about 185 Hiroshima bombs.

"That is why there is no impact crater," said Yeomans. "The great majority of the asteroid is consumed in the explosion."

Yeomans and his colleagues at JPL's Near-Earth Object Office are tasked with plotting the orbits of present-day comets and asteroids that cross Earth's path, and could be potentially hazardous to our planet.

Yeomans estimates that, on average, a Tunguska-sized asteroid will enter Earth's atmosphere once every 300 years. On this 100th anniversary of the Tunguska event, does that mean we have 200 years of largely meteor-free skies?

"Not necessarily," said Yeomans. "The 300 years between Tunguska-sized events is an average based on our best science. I think about Tunguska all the time from a scientific point of view, but the thought of a another Tunguska does not keep me up at night."

NASA's Phoenix Mars Lander performed its first wet chemistry experiment on Martian soil flawlessly yesterday, returning a wealth of data that for Phoenix scientists was like winning the lottery.

"We are awash in chemistry data," said Michael Hecht of NASA's Jet Propulsion Laboratory, lead scientist for the Microscopy, Electrochemistry and Conductivity Analyzer, or MECA, instrument on Phoenix. "We're trying to understand what is the chemistry of wet soil on Mars, what's dissolved in it, how acidic or alkaline it is. With the results we received from Phoenix yesterday, we could begin to tell what aspects of the soil might support life."

"This is the first wet-chemical analysis ever done on Mars or any planet, other than Earth," said Phoenix co-investigator Sam Kounaves of Tufts University, science lead for the wet chemistry investigation.

About 80 percent of Phoenix's first, two-day wet chemistry experiment is now complete. Phoenix has three more wet-chemistry cells for use later in the mission.

"This soil appears to be a close analog to surface soils found in the upper dry valleys in Antarctica," Kouvanes said. "The alkalinity of the soil at this location is definitely striking. At this specific location, one-inch into the surface layer, the soil is very basic, with a pH of between eight and nine. We also found a variety of components of salts that we haven't had time to analyze and identify yet, but that include magnesium, sodium, potassium and chloride."

"This is more evidence for water because salts are there. We also found a reasonable number of nutrients, or chemicals needed by life as we know it," Kounaves said. "Over time, I've come to the conclusion that the amazing thing about Mars is not that it's an alien world, but that in many aspects, like mineralogy, it's very much like Earth."

Another analytical Phoenix instrument, the Thermal and Evolved-Gas Analyzer (TEGA), has baked its first soil sample to 1,000 degrees Celsius (1,800 degrees Fahrenheit). Never before has a soil sample from another world been baked to such high heat.

TEGA scientists have begun analyzing the gases released at a range of temperatures to identify the chemical make-up of soil and ice. Analysis is a complicated, weeks-long process.

But "the scientific data coming out of the instrument have been just spectacular," said Phoenix co-investigator William Boynton of the University of Arizona, lead TEGA scientist.

"At this point, we can say that the soil has clearly interacted with water in the past. We don't know whether that interaction occurred in this particular area in the northern polar region, or whether it might have happened elsewhere and blown up to this area as dust."

Leslie Tamppari, the Phoenix project scientist from JPL, tallied what Phoenix has accomplished during the first 30 Martian days of its mission, and outlined future plans.

The Stereo Surface Imager has by now completed about 55 percent of its three-color, 360-degree panorama of the Phoenix landing site, Tamppari said. Phoenix has analyzed two samples in its optical microscope as well as first samples in both TEGA and the wet chemistry laboratory. Phoenix has been collecting information daily on clouds, dust, winds, temperatures and pressures in the atmosphere, as well as taking first nighttime atmospheric measurements.

Lander cameras confirmed that white chunks exposed during trench digging were frozen water ice because they sublimated, or vaporized, over a few days. The Phoenix robotic arm dug and sampled, and will continue to dig and sample, at the 'Snow White' trench in the center of a polygon in the polygonal terrain.

"We believe this is the best place for creating a profile of the surface from the top down to the anticipated icy layer," Tamppari said. "This is the plan we wanted to do when we proposed the mission many years ago. We wanted a place just like this where we could sample the soil down to the possible ice layer."

The Phoenix mission is led by Peter Smith of The University of Arizona with project management at JPL and development partnership at Lockheed Martin, located in Denver. International contributions come from the Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus, Denmark; Max Planck Institute, Germany; and the Finnish Meteorological Institute.

Image Credit: NASA/JPL-Caltech/University of Arizona/Max Planck Institute

NASA engineers and scientists completed a milestone review June 20 that will help determine the systems needed to return humans to the moon and establish a lunar outpost.

The three-day Lunar Capability Concept Review capped a nine-month study led by the Exploration Systems Mission Directorate at NASA Headquarters in Washington that incorporated science and exploration objectives earlier developed by representatives of 14 countries as part of the Global Exploration Strategy.

The study looked at possible lunar mission scenarios and compared them to the capabilities of the emerging Ares V heavy lift launch vehicle and the Altair lunar lander design concepts. This review of those findings, led by the Constellation Program Office at NASA's Johnson Space Center in Houston, established all the technical parameters that will be needed to begin Phase A, the first phase in preparing vehicle requirements.

"We confirmed that Constellation's conceptual designs for both Ares V and Altair will enable us to land astronauts and cargo anywhere on the moon and to build an outpost supporting widespread exploration of the lunar surface," said Jeff Hanley, Constellation Program manager at Johnson. "This extensive review proves we are ready for the next phase: taking these concepts and moving forward to establish mature requirements."

According to Hanley, the study bears out the strength of the initial concepts showing the vehicles can be built and delivered in time to return humans to the moon by 2020.

The review also reinforced the key role of international partnerships and industry collaboration to developing the lunar surface systems for human missions to the moon.

Phase A begins the process of defining the vehicle and element requirements. During this phase, the Ares V and Altair Project teams will take what was learned from the Lunar Capability Concept Review and baseline the needs for lunar missions, establish the design needs and determine plans for advancing the technologies needed to be successful. Phase A will culminate in a Systems Requirements Review for NASA's lunar transportation architecture, tentatively planned for 2010.

The review refined early configurations of the Ares V rocket to ensure its capability to deliver the Altair lunar lander, four astronauts and cargo anywhere on the moon and return the crew to Earth at any time. To accomplish those objectives, the current configuration of the Ares V will use six RS-68B liquid oxygen and liquid hydrogen engines on a core stage along with two five-and-one-half segment solid propellant rocket boosters, which are a direct evolution from the first stage of the Ares I rocket. The Ares V upper stage will propel the Orion crew capsule and Altair to the moon using the same J-2X engine as the Ares I crew launch vehicle. The Ares V will stand about 381 feet tall and be able to send more than 156,600 pounds of cargo and components into orbit to the moon, and later to Mars or other destinations.

Altair will be capable of landing four astronauts anywhere on the moon, providing life support and a base for the first week-long surface exploration missions, and returning the crew to the Orion spacecraft for the ride home to Earth. A variant of the lunar lander will serve as an autonomous cargo carrier, taking modular outpost components, lunar rovers, and scientific equipment to the moon's surface.

The formal decision to start Phase A will be taken to NASA's leaders before the end of this year.

The Constellation Program Office at Johnson has the responsibility for developing the next human space transportation system that will be used to extend a human presence throughout the solar system. The program includes multiple project offices and technical teams at all ten NASA centers and at contract organizations around the nation. The Orion Project and Altair Project also are led from Johnson. The Ares Project Office at NASA's Marshall Space Flight Center in Huntsville, Ala., leads the design and development of the Ares I rocket and Ares V cargo launch vehicle. The Ground Operations Project at NASA's Kennedy Space Center in Florida will handle ground and launch operations for the vehicles.

NASA's Phoenix Mars Lander Saturday beamed back images showing that Phoenix’s Robotic Arm successfully sprinkled soil onto the delivery port of the lander's Optical Microscope.

Mission scientists said enough of the fine-grained soil sample remains in the scoop of the lander's Robotic Arm for delivery to either the Wet Chemistry Lab or Thermal and Evolved-Gas Analyzer. Both the Wet Chemistry Lab and the Optical Microscope are part of the Microscopy, Electrochemistry and Conductivity Analyzer, or MECA, instrument.

"We want to deliver similar soil samples to all three instruments," said Ray Arvidson, the mission's lead scientist for digging activities, from Washington University in St. Louis.

The lander's Robotic Arm has been commanded to remain in an "up" position to hold the collected soil in the scoop until it can be delivered to the other instruments.

The Phoenix mission is led by Peter Smith of the University of Arizona with project management at JPL and development partnership at Lockheed Martin, located in Denver. International contributions come from the Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus, Denmark; Max Planck Institute, Germany; and the Finnish Meteorological Institute. For more about Phoenix, visit the website.

Last week, space shuttle Discovery touched down after a historic mission to the International Space Station, a flight that not only launched the largest laboratory to date, but also the 50th female U.S. astronaut. Just eight weeks prior, astronaut Peggy Whitson returned to Earth after a six-month stay in orbit as the first female space station commander. Women have established their place in space, but it was the flight of Sally Ride 25 years ago that paved the road to the stars.

Born in Encino, CA on May 26, 1951 to Dr. & Mrs. Dale Ride, Sally Ride’s early love was tennis. After winning a tennis scholarship to Westlake School for Girls in Los Angeles, she dropped out of Swarthmore college to pursue a professional tennis career.

Picking up the Stanford University newspaper, she read about NASA’s search for astronauts & decided to apply to be an astronaut. Over 8000 people applied. 35 were accepted, including 6 women, one of whom was Sally Ride.

Read more... Sally Ride biography.

Seven astronauts flew space shuttle Discovery back to NASA's Kennedy Space Center on Saturday to end the latest construction mission to the International Space Station.

Commander Mark Kelly and Pilot Ken Ham were at the controls of Discovery as it glided through Florida skies to touch down on time at 11:15 a.m. EDT.

Kelly, Ham and Mission Specialists Karen Nyberg, Ron Garan, Mike Fossum and Japan's Akihiko Hoshide spent 14 days in orbit installing the Japanese Pressurized Module to the space station. The module is the largest section of the Japanese laboratory called "Kibo," or hope. Garrett Reisman also returned onboard Discovery. He spent three months living on the space station.

Talking to the news media a few hours after landing, the crew of STS-124 beamed about the flight.

"I think I have the best space shuttle crew of all-time," Kelly said.

Although there are more pieces to add on future flights, Fossum said the addition of Kibo made the station look nearly complete.

"It was a great feeling of accomplishment as we backed away (from the station)," he said.

Hoshide, one of the astronauts of the Japan Aerospace Exploration Agency, spent time on Earth monitoring Kibo's preparation for space. Saying goodbye to it in orbit was not easy.

"When we went to close the hatch, that was a tender moment, it was kind of sad," he said.

NASA and Japanese officials hailed the flight just after landing.

"I can't think of a mission really that's been better than this one," said Bill Gerstenmaier, NASA's associate administrator of Space Operations. "We're starting to break that tie to planet Earth and get out and do what exploration is."

Discovery returned to its base in good shape, said Michael Leinbach, shuttle launch director.

"It's just a terrific day here at the Kennedy Space Center."

Astronaut Ron Garan came back with a unique spacewalking experience. Perched at one end of the station's long robotic arm, he swung far out and away from the shuttle and station to move a nitrogen tank into place.

"I got the impression I wasn't just looking at the Earth, I was looking at a planet hanging in space," he said.

After a night at Kennedy, the crew will fly to Ellington Field near NASA's Johnson Space Center in Houston.

NASA's next shuttle flight is slated for October when the crew of STS-125 is to service the Hubble Space Telescope.

Image Credit: NASA/Kevin O'Connell

According to UPI, several couples have been in contact with New Mexico based Virgin Galactic hoping to be the first to have sex in space. They quote Will Whitehorn, president of the company, as saying, "We've had a variety of people inquire about it. One got in touch about a charter flight so they could be the first to have intercourse in space and get in the Guinness Book of Records."

Veteran science journalist Laura Woodmansee (author of "Sex in Space") says this curiosity is to be expected. "Many have wondered what it might be like to make love in space. The passionate couples who book flights to the very first space hotel will be more than excited to try zero-g sex."

Virgin's first planned space tourism flight is expected to take place in 2009.

One week after landing on far-northern Mars, NASA Phoenix spacecraft lifted its first scoop of Martian soil as a test of the lander's Robotic Arm.

The practice scoop was emptied onto a designated dump area on the ground after the Robotic Arm Camera photographed the soil inside the scoop. The Phoenix team plans to have the arm deliver its next scoopful, later this week, to an instrument that heats and sniffs the sample to identify ingredients.

A glint of bright material appears in the scooped up soil and in the hole from which it came. "That bright material might be ice or salt. We're eager to do testing of the next three surface samples collected nearby to learn more about it," said Ray Arvidson of Washington University in St. Louis, Phoenix co-investigator for the Robotic Arm.

The camera on the arm examined the lander's first scoop of Martian soil. "The camera has its own red, green and blue lights, and we combine separate images taken with different illumination to create color images," said the University of Arizona's Pat Woida, senior engineer on the Phoenix team.

The Phoenix mission is led by Peter Smith at the University of Arizona with project management by NASA's Jet Propulsion Laboratory, Pasadena, Calif., and development partnership at Lockheed Martin, Denver. International contributions come from the Canadian Space Agency; the University of Neuchatel, Switzerland; the universities of Copenhagen and Aarhus, Denmark; Max Planck Institute, Germany; and the Finnish Meteorological Institute. For more about Phoenix, visit the website.

Image Credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University
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Space shuttle Discovery and its seven-member crew lifted off from NASA's Kennedy Space Center at 5:02 p.m. EDT Saturday to deliver and install a Japanese laboratory on the International Space Station. It is scheduled to dock with the International Space Station today at about 1:50 p.m. EDT.

About an hour before docking, STS-124 Commander Mark Kelly and Pilot Kenneth Ham will guide the shuttle through a Rendezvous Pitch Maneuver, or back-flip, giving the Expedition 17 crew the opportunity to take pictures of the orbiter’s protective heat-resistant tiles. These photos will be sent to engineers on Earth for analysis.

The STS-124 and Expedition 17 crews are slated to conduct pressure and leak checks to prepare for the opening of the hatches between the two spacecraft, which is scheduled for about 3:50 p.m. They will then greet each other to begin nine days of joint operations.

Mission Specialist Greg Chamitoff is joining the Expedition 17 crew by trading places with Flight Engineer Garrett Reisman. The 10 crew members aboard the orbiting complex are also preparing for the first of three STS-124 spacewalks, which Mission Specialists Mike Fossum and Ron Garan are scheduled to begin at 11:32 a.m. Tuesday.

Image Credit: NASA TV