00:00Definition. Planets are celestial bodies orbiting a star,
00:04massive enough to be rounded by their gravity,
00:07but not massive enough to cause thermonuclear fusion.
00:10Solar System.
00:12Our solar system has eight planets.
00:14Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
00:21Earth.
00:22The only known planet to support life,
00:25with liquid water on its surface.
00:27Gas giants.
00:29Jupiter and Saturn are gas giants,
00:31primarily composed of hydrogen and helium.
00:34Ice giants.
00:35Uranus and Neptune are ice giants,
00:38with cores surrounded by icy materials.
00:41Dwarf planets.
00:42Pluto, Eris, and Haumea are examples of dwarf planets,
00:47smaller than the main planets, but still orbiting the sun exoplanets.
00:51Planets outside our solar system,
00:53discovered orbiting other stars,
00:56with thousands identified so far.
00:58Habitability.
01:00Scientists search for exoplanets in the habitable zone,
01:03where conditions might support liquid water and potentially life.
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