The relevant magnitude is mainly the black holes' mass. Since black holes are the result of collapsing stars, yes, there are black holes with the mass of a star.
The diameter is usually taken as the diameter of the event horizon. This diameter is directly proportional to the mass; a supermassive black hole such as Sag A* has a diameter comparable to that of a large star.
False. Only the most massive stars will become black holes.
False. Medium-sized stars become white dwarfs. Only the most massive stars form black holes.
No. They do not have enough mass to become black holes. Depending on the mass they will either become white dwarfs or neutron stars.
Except for supemassive black holes, no. Most black holes have about the same mass as a star, but the event horizon is only a few miles across.
All dead big stars do not form black holes because sometimes the collapse of the star is stopped at a smaller size before it becomes a black hole.
Dead stars are not necessarily black holes. Dead stars can become white dwarfs, neutron stars, or black holes depending on their mass. Only the most massive dead stars can collapse further to become black holes if they exceed the Chandrasekhar limit, around 1.4 times the mass of the Sun.
No. Black holes are the remnants left behind when the very largest stars die.
The most massive stars become black holes.
They are called "black holes".
Not all stars do but stars can turn into black holes. Small ones turn in to a black dwarf star when it dies. Medium ones turn in to a neutron then in to a red giant star and then to white dwarf star Large size stars becomes a blackhole..........
That is correct. A star the size of our Sun will not form a black hole when it dies. Instead, it will likely become a white dwarf. Black holes are typically formed from the remnants of more massive stars.
Stars can be sucked into black holes.