What if Earth had two suns?

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In respect to this, why is the blood moon red?

Blood moo. As sunlight penetrates the atmosphere of Earth, the gaseous layer filters and refracts the rays in such a way that the green to violet wavelengths on the visible spectrum scatter more strongly than the red, thus giving the Moon a reddish cast. What planet crashed into the Earth? Theia Theia is a hypothesized ancient planet in the early Solar System that, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris gathering to form the Moon.

Then, can a wormhole exist?

Einstein's theory of general relativity mathematically predicts the existence of wormholes, but none have been discovered to date. A negative mass wormhole might be spotted by the way its gravity affects light that passes by. Do we live in black hole? We can't calculate what happens in a black hole's singularity - the laws of physics literally break down - but we can calculate what happens on the boundary of an event horizon. We might live in a universe within a black hole within a universe within a black hole. It might just be black holes all the way down.

Correspondingly, what is behind a black hole?

At the center of a black hole, it is often postulated there is something called a gravitational singularity, or singularity. This is where gravity and density are infinite and space-time extends into infinity. Just what the physics is like at this point in the black hole no one can say for sure.