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It's a disc (or disk).
The answer to that is entirely your opinion.
My planet Earth, which is also your planet Earth, is known for having the best restaurants, the most beautiful women, the most exciting roller coasters, the best chess players, and really, the only life we know of in the entire solar system. We all know it as the planet that we live on.
Not since 1846, no. Everything discovered in the solar system since then is considered to be at best a dwarf planet.
A
the best planet in the solar system,MARS!!!!!!!!!!!!!!!!!!!!!!!!!!`
The best guess is that our solar system is about 8 billion years old.
The planet that most resembles Earth in many factors is Mars. However, no planet most resembles the Earth in all factors.
Airheads (planet), Starburst (planet), Laffy Taffy (planet), CRUNCH (asteroid belt)
Because we are here and we think we are the best.
D. The sun. All planets in our solar system orbit the sun thus it is the best reference when describing the motion of the planets within that solar system.
Earth. Unless you mean besides Earth, then maybe Mars. Mars has a similar temperature, ice at the poles, and water vapor in the atmosphere, and has somewhat similar gravity (0.4 that of Earth's), but has insufficient oxygen and atmospheric pressure to support human life. No other planet within our solar system can, at present, can support our kind.