Andesite, a fine-grained rock that is widely distributed in the earth's crust. Andesite reaches the surface as lava from volcanoes. As it cools it forms gray to grayish-black sheets, often in thick accumulations. Andesite consists chiefly of feldspar minerals mixed with smaller amounts of iron and magnesium. It was named for the Andes of South America, where it is widely found. Andesite is used for building stone and monuments.
A black hole occurs when a massive star dies -- its enormous mass implodes and becomes so heavy that it bends space. So how do astronomers detect something that they can't see?
While routinely scanning the stars, NASA scientists came across something they didn't expect to see: a vast area of space empty of stars, planets and matter.