According to the big bang theory, a)earth's moon was created from a collision with marsb) the universe was created from a cosmic explosion c) our solar system is shrinking and will eventually collapse into the sun d) in about 5 billion years, the sun will swell and engulf the inner planets

The answer is B. the universe was created from a cosmic explosion.

It is called the Big Bang Theory, but actually there was no REAL explosion. What happened was the universe expanded from a really dense and hot superforce. There were no stars, atoms, and the like. This point was called "singularity,"- a mass that contained all the mass, and the space-time of the universe.

b.transmitters send radio waves, and receivers capture radio waves.