Black holes are categorized by mass and size, ranging from supermassive black holes, which can be up to several billion times the mass of the Sun, to theoretical micro black holes, which are much smaller. Their formation remains a subject of debate, alongside various myths and paradoxes associated with their existence. Despite their invisibility, evidence supports the presence of black holes, such as the example of Cygnus X-1.

1. Black Hole

2. What are they?

3. Schwarzschild Rotating Charged Types

4. Class Class Mass Size Supermassive black hole ~10^5–10^9 × Mass of the Sun (Size=~0.001–10 AU) (1Astronomical unit=149,597,871 kilometres) Intermediate-mass black hole ~10^3× Mass of the Sun (size=~10^3 km = REarth) Stellar-mass ~10× Mass of the Sun ~30 km Micro black hole up to ~Mass of the Moon (Size=up to ~0.1 mm) micro black holes are in theory only as there too small too see

5. Formation

6. Paradox and myths Disapearance Vacum Worm holes

7. If We Can't See Them, How Do We Know They're There?

8. Cygnus X-1