Study notes, data, statistics on planets, astronomical beings, the greenhouse effect
Date Submitted: 06/21/2004 22:52:16
Category: / Science & Technology / Physics
Length: 6 pages (1683 words)
Category: / Science & Technology / Physics
Length: 6 pages (1683 words)
Future Telescopes
* a newly proposed Exo-Earth Imager (EEI) could show astronomers an Amazon-size forest, with its green hint of biology, on an Earth-size planet 30 light years away.
*It's a bold promise, considering that NASA and the European Space Agency are still a dozen years away from even attempting a Terrestrial Planet Finder (TPF) that could barely see such worlds as tiny specks.
*One NASA concept envisions a spaceborne array of 20 telescopes, each 26 feet in diameter …
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…Discovered By: William Herschel
Date of Discovery: 1781
Distance from the Sun: (Semimajor axis of orbit) 2,870,972,200 km 19.19126393 A.U.
Radius: 25,559 km (4.007 of Earth's radius)
Volume: 52 (Earth = 1)
Mass: 86.849 x 1027 g
Density: 1.30 gm/cm3
Surface Gravity: 869 cm/s2
Escape Velocity: 21.29 km/s
Sidereal Rotation Period: 0.71833 (retrograde)
Sidereal Orbit Period: 84.016846 sidereal years
Mean Orbit Velocity: 6.8352 km/s
Orbit Eccentricity: 0.04716771
Orbit Inclination: 0.76986 degrees
Equatorial Inclination: 97.86 degrees
Atmospheric Temperature (at level with pressure = 1 bar): 76 K
Major Atmospheric Constituents: H2, He, CH4
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