This is a star less than mass of the main sequence star that has exhausted all of its nuclear fuel and has collapsed to a very small size.

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

In a system, when potential energy decreases, then entropy also decreases. true false

Sound is a disturbance that travels through a medium as a