- 産業: Astronomy
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Planetary Science Research Discoveries (PSRD) is an educational site sharing the latest research by NASA-sponsored scientists on meteorites, asteroids, planets, moons, and other materials in our Solar System. The website is supported by the Cosmochemistry Program of NASA's Science Mission ...
The region of "altered space" that will interact with the magnetic properties of a magnet. It is located mainly between the opposite poles of a magnet or in the energetic space about an electric charge in motion.
Industry:Astronomy
An element with atomic number 6; symbol: C. Graphite is a low-pressure form of carbon. Diamond is a high-pressure form of carbon. (Carbon is one of the four elements essential for life. The others are hydrogen, oxygen, and nitrogen. )
Industry:Astronomy
The process by which plants convert water and carbon dioxide into carbohydrates, using sunlight as the source of energy and the aid of chlorophyll.
Industry:Astronomy
The mean Earth-Sun distance, equal to 149. 5 million kilometers or 93 million miles.
Industry:Astronomy
Invisible part of the light spectrum where wavelengths are shorter than the visible spectrum and longer than X rays.
Industry:Astronomy
The portion of Earth, or other planet, that is water, including liquid water, ice, and water vapor on the surface, underground, or in the atmosphere.
Industry:Astronomy
Explosive eruption of lava producing and ejecting hot fragments of rock and lava.
Industry:Astronomy
The European Space Agency's first spacecraft to Mars, Mars Express launched in June 2003. The mission objectives are to search for subsurface water from orbit with a set of seven remote sensing instruments. The lander, Beagle 2, was released from the orbiter six days before Mars Express went into orbit around Mars, however, no signal was received from it despite repeated attempts at communication from a variety of spacecraft and Earth-based telescopes. Beagle 2 was declared lost on February 2004. The orbiter is operational and is expected to continue through 2014. Mars Express website.
Industry:Astronomy
U. S. Missions to Mars with twin rovers equipped with tools to study a diverse collection of rocks and soils that may hold clues to past water activity on Mars. MER-A, named "Spirit," launched on June 10, 2003 for a seven-month journey to a landing site in Gusev Crater and MER-B, named "Opportunity," launched on July 7, 2003 toward a landing site in Terra Meridiani.
Industry:Astronomy
Of the 24,000+ meteorites collected on Earth, only 30+ have been identified as meteorites from Mars. They are generally divided into three groups (all with relatively young ages slightly over 1 billion years old). The groups are the Shergottites, Nakhlites, and Chassignites. A Martian meteorite that does not fall into one of these groups is ALH 84001, a cumulate rock composed mostly of orthopyroxene, which is much older than all the others with an age of 4. 5 billion years. A NASA-sponsored research team reported in 1996 that ALH 84001 may contain evidence of past primitive life on Mars--an idea that remains a topic of great debate and continued investigation. (See Mars Meteorites compiled by Ron Baalke from the Jet Propulsion Laboratory. )
Industry:Astronomy
