Riddle

I am a mother from a family of eight. Spins around all day despite my weight. Had a ninth sibling before finding out its fake. What am I?

Choose an answer

A.The moon
B.Mars
C.The solar system
D.Earth
Hint: It's a word with 5 letters, starting with "E".

Answer

Earth

Why this is the answer

Earth is one of eight planets orbiting the sun, spins on its axis daily, and once had a supposed 'ninth sibling,' Pluto, until it was reclassified as a dwarf planet.

This riddle is filed under "What Am I?" Riddles and rated Hard.