A black hole because it can be small and massive and not even light can escape it.
A black hole because it can be small and massive and not even light can escape it.
Black holes - and not all are small.
Your category is the answer, that thing is black hole
A black hole is formed when the remains of a massive star collapse under their own gravity, creating a region of spacetime where gravity is so strong that not even light can escape. The mass is concentrated into a small volume called the singularity at the center of the black hole, surrounded by an event horizon beyond which nothing can escape.
Black holes are black because their gravitational pull is so strong that not even light can escape from them. This strong gravitational pull is caused by the massive amount of matter packed into a small space, creating a dense and compact object with intense gravity.
A black hole
Black holes are made of extremely dense matter that has been squeezed into a small space. They form when a massive star collapses under its own gravity at the end of its life cycle. This collapse creates a gravitational pull so strong that not even light can escape, creating a region of spacetime from which nothing can escape, known as a black hole.
Gravity density. Whenever a sufficient mass is squeezed into a small enough volume ... then a black hole occures. "Normally" this only ocures when a massive star runs out of (hydrogen) fuel and collapses in on itself.
it's small size and low gravity
Hydrogen is the gas most affected by thermal escape in planetary atmospheres. Its low molecular weight makes it more likely to escape a planet's gravitational pull and be lost to space over time. This process is most pronounced for small, low-gravity planets.
Anything with mass has gravity. Anything massive enough to be considered a planet has noticeable gravity, whether it is a giant planet like Jupiter or a small planet like Mercury.
Gravity is not a 'wave', it is a field of curvature of space-time caused by objects with mass. A black hole contains the mass of a star, compressed to the space of a single atom (a singularity), the compression of so much mass into such a small space, is why the black hole has such a powerful gravitational pull.