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2. Planet - Wikipedia

   en.wikipedia.org/wiki/Planet

   The eight planets of the Solar System with size to scale (up to down, left to right): Saturn, Jupiter, Uranus, Neptune (outer planets), Earth, Venus, Mars, and Mercury (inner planets) A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. [1]

3. List of planet types - Wikipedia

   en.wikipedia.org/wiki/List_of_planet_types

   Planets whose orbits lie within the orbit of Earth. [nb 1] Mercury and Venus: Inner planet: A planet in the Solar System that have orbits smaller than the asteroid belt. [nb 2] Mercury, Venus, Earth, Mars: Outer planet: A planet in the Solar System beyond the asteroid belt, and hence refers to the gas giants. Jupiter, Saturn, Uranus and Neptune ...

4. Solar System - Wikipedia

   en.wikipedia.org/wiki/Solar_System

   [f] Six planets, seven dwarf planets, and other bodies have orbiting natural satellites, which are commonly called 'moons'. The Solar System is constantly flooded by the Sun's charged particles, the solar wind, forming the heliosphere. Around 75–90 astronomical units from the Sun, [g] the solar wind is halted, resulting in the heliopause.

5. Odyssey (children's magazine) - Wikipedia

   en.wikipedia.org/wiki/Odyssey_(children's_magazine)

   Odyssey was a monthly science magazine for children ages 9–14, created by Richard Berry, editor of Astronomy. The magazine was published between 1979 and 2015. It was based in Peterborough, New Hampshire. [1] The magazine was also headquartered in Milwaukee, Wisconsin. [2]

6. List of Solar System objects by size - Wikipedia

   en.wikipedia.org/wiki/List_of_Solar_System...

   For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [ 11 ] Because Sedna and 2002 MS 4 have no known moons, directly determining their mass is impossible without sending a probe (estimated to be from 1.7x10 21 to 6.1×10 21 kg for Sedna [ 12 ] ).

7. Astronomy - Wikipedia

   en.wikipedia.org/wiki/Astronomy

   Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics , physics , and chemistry in order to explain their origin and their overall evolution .