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- Astronomy (13970 bytes)
3: ...onomy: the large crater is [[Daedalus (crater)|Daedalus]], photographed by the crew of [[Apollo 11]] a...
8: ... the actual physical nature of celestial objects—what makes them "tick".
10: ...onal astronomy is concerned mostly with acquiring data, which involves building and maintaining instru...
15: ...hotographed by [[Mars Global Surveyor]], the long dark streak is formed by a moving swirling column of...
71: ... the motions of the naked-eye objects. The [[Rigveda]] refers to the 27 [[constellations]] associated ... - Planetary system (2476 bytes)
5: ...to make this a viable model. Accepted theories today argue that planetary systems form from a [[solar...
7: ...ow form in the [[accretion disk]] which surrounds pulsars.
11: ...m discoverd, the first multi planet system with a pulsar discovered
12: * [[Upsilon Andromedae]] - the first multiplanet extrasolar planetary s... - Planet (8450 bytes)
28: ...or rocky: Planets that are similar to [[Earth]] — with bodies largely composed of [[Rock (geolog...
43: ...factor of 2.8; S/1993 243 (1) [[Dactyl (asteroid)|Dactyl]] by a factor of 1.3; and, most remarkably, [...
48: ...]s (those outside our solar system) discovered to date have masses which are about the same or larger ...
50: ...ed-out star, or [[supernova]] remnant, called a [[pulsar]], comparable in size to the terrestrial planets;...
56: ... solar system. No interstellar planet is known to date, but their existence is considered a plausible ... - History of science in early cultures (11033 bytes)
9: ...r of Pythagorean triplets (3,4,5) (5,12,13). ..., dated 1900 BC, possibly millennia before Pythagoras{...
11: ...n in what is now Turkey, would use the collected data and improve [[Hipparchus]]' value for the [[pre...
16: ... of [[India]]. Their design can be conservatively dated to the [[1st millennium BC]]. Around 1800 BC, ...
38: ...g this period, while [[Hippocrates]] laid the foundations of medicine as a branch of science.
45: ...ny of the [[Constellation|constellations]] used today through the [[Almagest]]. The [[Ptolemaic system... - Star (12279 bytes)
3: ...pear as a disk instead, and to provide [[sunlight|daylight]].
9: ... diameter about 1,000 times larger than the Sun —about 1.6 [[terametre]]s. However, these have a...
11: ...known is [[Eta Carinae|η Carinae]], with 100–150 times as much mass as the Sun. Recent work ...
29: ...dimmer and dimmer, fading into [[black dwarf]]s —although none exist yet.
36: ...emains will collapse into a [[neutron star]] (a [[pulsar]] or [[X-ray burster]]) or, in the case of the la...
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