space

space

1. constellations

   • A constellation, in astronomy, is the limit in which the celestial vault is divided, each one is made up of a conventional grouping of stars, whose position in the night sky is apparently invariable.
   • characteristic
     • color, temperature, size, composition, and brightness
   • composition
     • Stars in constellations can appear near each other in the sky, but they usually lie at a variety of distances away from the Earth

2. planets

   • characteristic
     • is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium shape
   • composition
     • hey are composed primarily of the two elements hydrogen and helium, with 75% of their mass being hydrogen and 25% helium
   • A planet is an astronomical object orbiting a star that is massive enough to be rounded off by its own gravity, but not massive enough to cause thermonuclear fusion, and that has cleared its neighboring region of planetesimals.

3. stars

   • A star is a luminous plasma spheroid that maintains its shape due to its own gravity.
   • characteristic
     • brightness, color, surface temperature, size and mass
   • composition
     • star's atmosphere consists mostly of hydrogen (87%) and helium (10%), with all other elements making up about 3%

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