A. visible light B. Nebulas C. Helium or D. Xrays
Astronomers think that the areas around black holes suck everything in like when a tub drains. But black holes are large amounts of matter that is packed into a small area.
specifically, "astronomers" that study black holes are called cosmologists.
Yes, black holes are known and regarded by many scientists, astronomers, and physicists.
Because the astronomers can detect that a star is being whirled around in space, or space is being distorted.
Black Holes
Astronomers
There are no black holes but there are dark areas known as Sun spots.
Black holes do not emit light, so we cannot observe them directly
Astronomers say that there are several, possibly many, black holes, all a long way from Earth.
No. The apparent dark areas on the sun are not black holes; they are sunspots. Sunspots are areas of the sun's surface that are not as hot as their surroundings.
Astronomers believe that there are black holes, but I will add that they have only been observed indirectly at great distances, so it may be that the interpretation of our observations will change in the future.
Although the disciplines may overlap with others, it's safe to say that generally astronomers, physicists and astrophysicists study black holes; particle physicists study particles.