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What was the object that collided with Earth, according to the giant-impact hypothesis?

a comet

a moon

an asteroid

a planet

According to the giant impact hypothesis Earth once collided with a planet of Mars size usually referred to as Theia, a titaness of Greek mythology, mother of Selene - Moon goddess, which is to reflect the believe the collision was an origin of the Moon.

smyru

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Carolina Ödman wikipedia → Giant-impact hypothesis

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What are the most luminous objects in the universe?

supergiant stars

What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?

supermassive stars

gamma-ray burst

What was the most beautiful comet of the second half of the twentieth century, with two tails visible to the naked eye?

Comet Hale-Bopp

There was no such comet

Who is that?

Angelique Kerber

Agnieszka Radwańska

Caroline Wozniacki