Planetary embryo Theia collided with Earth to create planet

Q.  What is Theia?
- Published on 02 Feb 16

a. Planetary embryo
b. Planet
c. Planetoid
d. None of the above

ANSWER: Planetary embryo
 
A massive head on collision created earth when planetary embryo Theia around the size of Mars collided with earth 4.5 billion years back when the planet was 100 million years old. It was more of a head on collision according to UCLA researchers and force of the impact resulted in early Earth and Theia, together to form a single planet, with a piece breaking off and entering its gravitational pull to form the moon.

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