Archive for the Category »Nasa space program «

cassini flyby5 Cassini Flies over Enceladus

Today “Cassini is set to begin a series of scraping Enceladus flybys that will take place in 2008 and will take us flying within a mere 50 km (~ 30 miles) over the equatorial region of the moon, approaching from the north and then departing towards the south, with passage through the edges of the moon’s famous south polar plume” said Catheryn Porco, Cassini Imaging Team Leader. At closest approach, the spacecraft will pass the moon at a speed of about 14 kilometers (9 miles) per second. “We will make several daring plunges over the surface of Enceladus and through its plume of vapor and icy particles,” said Porco. “These maneuvers will take us deep into the plume and allow many of Cassini’s instrument teams to improve their measurements of the region’s properties. The heat-sensing instrument will map the tcassini flyby3 Cassini Flies over Enceladuserrain’s thermal emission over a wider area than before in search of additional hot spots, and the instrument capable of sniffing out the plume’s composition will improve tenfold its measurements of the plume’s molecular concentrations. All of us are eager to learn if we are correct in suspecting that organic-rich, liquid water reservoirs are truly the sources of the moon’s dramatic geologic activity…We should come away, in particular, with a better measure than we’ve had up until now of the abundances of ammonia and some simple organic compounds, both of which are important to ascertaining the astrobiological potential of the source environment of the jets.”
The Voyagers showed that Enceladus is only 500 km in diameter and reflects almost 100% of the sunlight that strikes it. Voyager 1 found that Enceladus orbited in the densest part of Saturn’s diffuse E ring, indicating a possible association between the two, while Voyager 2 revealed that despite the moon’s small size, it had a wide range of terrains ranging from old, heavily cratered surfaces to young, tectonically deformed terrain, with some regions with surface ages as young as 100 million years old.

The Cassini spacecraft of the mid- to late 2000s acquired additional data on Enceladus, answering a number of the mysteries opened by the Voyager spacecraft and starting a few new ones. As a result of several close flybys of Enceladus in 2005, the probe discovered a water-rich plume vcassini flyby jetson enceladus Cassini Flies over Enceladusenting from the moon’s south polar region. This discovery, along with the presence of escaping internal heat and very few (if any) impact craters in the south polar region, shows that Enceladus is geologically active today. Moons in the extensive satellite systems of gas giants often become trapped in orbital resonances that lead to forced libration or orbital eccentricity; proximity to the planet can then lead to tidal heating of the satellite’s interior, offering a possible explanation for the activity.

Enceladus is one of only three outer solar system bodies (along with Jupiter‘s moon Io and Neptune‘s moon Triton) where active eruptions have been observed. Analysis of the outgassing suggests that it originates from a body of sub-surface liquid water, which along with the unique chemistry found in the plume, has fueled speculations that Enceladus may be important in the study of astrobiology.The discovery of the plume has added further weight to the argument that material released from Enceladus is the source of the E-ring (Wikipedia).

Enceladus was named after the Titan Enceladus of Greek mythology. The name was chosen because Saturn, known in Greek mythology as Cronus, was the leader of the Titans.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA’s Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.For more information about the Cassini-Huygens mission, visit http://saturn.jpl.nasa.gov and the Cassini imaging team home page, http://ciclops.org.

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NASA atlantis launch01 NASA Launches Atlantis—Friday Feature

Space, the final frontier…To boldly go where no man has gone before…”—Captain Kirk, Star Trek

Yesterday, the space shuttle Atlantis and its crew of seven astronauts launched “on spectacular plumes of gold-tipped smoke … carrying Europe’s primary contribution to the International Space Station – the Columbus science laboratory” according to NASA. “The lab is filled with racks for experiments and research equipment and has fixtures on its exterior to also host research exposed to the vacuum of space,” continues NASA. “It represents the latest international addition to a facility already made of structures from the United States, Russia and Canada.”

“It shows that there is a real partnership between communities,” NASA Administrator Mike Griffin said. According to NASA, the launch was crucial for the European Space Agency because the Columbus lab represents a cutting edge research facility for Europe and the continent’s first manned spacecraft. “Today we are opening a new chapter for ESA,” said Jean-Jacques Dordain, the European Space Agency director general. “Just as Columbus discovered the New World, with Columbus, we are discovering a whole new world.”

NASA buzz aldrin NASA Launches Atlantis—Friday FeatureThe event brought back stirring memories of NASA moments for me (e.g., the Mercury, Gemini, then Apollo series; man’s first walk on the moon, then the launch of the first space shuttle). So, today, in honor of yesterday’s launch, I dedicate this Friday Feature to the ambitious and highly valuable NASA program; a program that has steadfastly persisted and prevailed over funding cuts, political intrigue, commercial competition, scientific slashing and public apathy.

The International Space Station (ISS) is the largest and most complex international scientific project in history and represents a move of unprecedented scale off plNASA ISS04 NASA Launches Atlantis—Friday Featureanet Earth. The station draws upon the scientific and technological resources of 16 nations: United States, Canada, Japan, Russia, 11 nations of the European Space Agency and Brazil.More than four times as large as the Russian Mir space station and a mass of about 1,040,000 pounds, the ISS measures 356 feet across and 290 feet long, with almost an acre of solar panels providing electrical power to six state-of-the-art laboratories. The station orbits at an altitude of 250 statute miles with an inclination of 51.6 degrees. This orbit provides accessibility by all the international partners.

Assembled in orbit, the ISS is an example of the first hands-on work in space, involving more spacewalks than ever before and a new generation of space robotics. About 850 clock hours of spacewalks were required by Russian and U.S. astronauts over five years to maintain and assemble the station (which is scheduled to be complete by 2010 according to the Vision for Space Exploration). The United States developed and currently operates the station. International partners contributed key elements to the ISS including Canada’s 55-foot long robotic arm for maintenance and assembly, Japan’s laboratory with attached exposed exterior platform, Russia’s research modules and spacecraft, and the European Space Agency’s pressurized laboratory.

NASA ISS02 NASA Launches Atlantis—Friday FeatureThe station represents an unprecedented state-of-the-art laboratory complex in orbit, more than four times the size and with almost 60 times the electrical power for experiments — critical for research capability — of Russia’s Mir. Research in the station’s six laboratories have already lead to discoveries in medicine, materials and fundamental science that will benefit people all over the world. Through its research and technology, the station also serves as an indispensable step in preparation for future human space exploration. Research currently being performed aboard the station includes: investigations in protein crystals; tissue culture; life in low gravity; flames, fluids and metal in space; the nature of space; observations of Earth; and potential for commercialization.The first crew to live aboard the International Space Station, commanded by U.S. astronaut Bill Shepherd and including Russian cosmonauts Yuri Gidzenko as Soyuz Commander and Sergei Krikalev as Flight Engineer, was launched in early 2000 on a Russian Soyuz spacecraft.

On January 14, 2004, President Bush George W. Bush announced the Vision for Space Exploration, which represented the U.S. space policyUnited States space policy. It was seen as a response to the Space Shuttle Columbia disaster, the state of human spaceflight at NASA, and a way to regain public enthusiasm for space exploration.
The Vision calls for the space program to:

In a study by Zogby International of what Americans think of the NASANASA budget projection NASA Launches Atlantis—Friday Feature space program, 44% of respondents thought that tax dollars spent on the program should remain the same, 32% thought it should be increased, 16% thought it should be decreased and 4% wanted it scrapped altogether.

I’ve heard many a person argue against the apparent profligate spending of the U.S. government on the NASA space program at the expense of housing, health, and education (funny, I don’t hear them complaining about the excessive amount spent on the military). Benefits of the program to humanity are doubtful at best, they complain. Who cares about space, the existence of planets in the Vega system or dark matter when we have so many problems to fix right here on Earth? This practical though myopic view has always been the bane of research, by posing the challenge to defend its value NOW. Research doesn’t work that way (hardly anything of value works that way); discoveries often occur serendipitously (e.g., Fleming’s discovery of penicillin); and often following many years of arduous and dedicated work. NASA’s research is no different. Its entire space program is based on unknowns and “what ifs”, on faith and on hope and ultimately on a vision of the future, a dream.

I have and always will support the NASA program… their dream. I too am a dreamer. Aren’t we all? Isn’t that our very nature? To dream?

NASA, better than any other organization, whether private or government-funded, represents humanity’s eternal dream to understand our universe and ultimately ourselves. We have always been and will continue to be explorers, whether it was Jacques Cartier who sailed across inclement seas up the Gulf of Saint Lawrence to discover a primitive Canada, Jacques Cousteau who dove the abysmal depths of a vast sea to coax out its dark secrets, or Captain Jacques Quasar who sailed the solar winds of the Milky Way Galaxy to find sentient alien life and ultimately answer the question of who and what we are. What program better represents our yearning for knowledge, understanding, and ultimately wisdom? The space program has always been about humanity’s search for meaning in an existentialist chaos of apparent vacuum. What is the nature of our existence? Why are we here? Our outward journey has always been ultimately about coming home.

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