Named for the greek earth goddess gaea, holds that the earth as a whole should be regarded as a living organism and that biological processes stabilize the environment. first advanced by british b...
A round or elongated spot of light in the sky at a point 180 degrees from the sun. also called counterglow.
Increase in temperature caused when incoming solar radiation is passed but outgoing thermal radiation is blocked by the atmosphere (carbon dioxide is the major factor). very important on venus and...
Sun-centered; see copernicus, kepler, galileo.
The point at which the solar wind meets the interstellar medium or solar wind from other stars.
The space within the boundary of the heliopause containing the sun and solar system.
Used by planetary scientists to refer to water, methane, and ammonia which usually occur as solids in the outer solar system.
|interplanetary magnetic field (imf)|
The magnetic field carried with the solar wind.
0 kelvin is absolute zero; water melts at 273 k (= 0° c = 32° f); water boils at 373 k (= 100° c = 212° f). (developed by william thomson).
= 1000 grams = 2.2 pounds, the mass of a liter of water. (see also)
= 1000 meters = 0.62 miles.
Intersecting valley complex.
An instrument similar to radar that operates at visible wavelengths.
= 9.46053e12 km (= 5,880,000,000,000 miles = 63,239 au); the distance traveled by light in a year.
The outer edge of the apparent disk of a celestial body
= 1000 cm3 = 1.06 us quarts
A faint glow from light scattered off of interplanetary dust along the plane of the ecliptic.
The portion of a planetary magnetosphere which is pushed in the direction of the solar wind.
The degree of brightness of a celestial body designated on a numerical scale, on which the brightest star has magnitude -1.4 and the faintest visible star has magnitude 6, with the scale rule such...
Literally "sea" (a very bad misnomer, still in use for historical reasons); really a large circular plain
Mesa, flat-topped elevation.
Used by astrophysicists to refer to all elements except hydrogen and helium, as in: "the universe is composed of hydrogen, helium and traces of metals".
A rock of extra-terrestrial origin found on earth
A small rocky object orbiting the sun; smaller than an asteroid
1/1000 of a bar. standard sea-level pressure is about 1013 millibars.
The official term used for asteroids.
Mountain (plural: montes)
A fundamental particle supposedly produced in massive numbers by the nuclear reactions in stars. they are very hard to detect since the vast majority of them pass completely through the earth with...
Literally "ocean"; really a large circular plain
A planetary surface that has been modified little since its formation typically featuring large numbers of impact craters (compare young).
Shaped like an egg
Literally "swamp"; really a small plain
= 206265 au = 3.26 light year