idk about this. black holes are incredibly dense(a singularity or the maximum denseness something can be). The super massive black hole in the center of our galaxy, is smaller than our sun.

@Kaagan: The sun has a diameter of 1 392 684 km. If the sun was a black hole, it would be about 3 km, and Saggitarius A* has 4 000 000 times the mass of the sun, therefore it would have a diameter of 12 000 000 km.

Still less than earth`s orbit, d = 2 r = 150 000 000 km.

>The super massive black hole in the center of our galaxy, is smaller than our sun.

Singularities themselves don`t have a "size", because that doesn`t mean anything to a singularity. It doesn`t take up space. It`s infinitely dense. It`s literally smaller than the smallest possible thing can exist, because it`s a point, not a volume.

The only meaningful spatial boundary you can give to a black hole is its event horizon; the edge at which its gravitational pull is so great, light can`t escape it.

Technically, yes, the singularity is smaller than the sun. The black hole it resides in is very much a supermassive object.

- Supermassive black hole NGC1277 compared to the size of our solar system
To get seriously large black holes, you need to head for the Magellanic Clouds. That`s where the pricey real state is.

The Speed of Light. Look it up.

The diameter of the Earth`s orbit.

?... its the average radius of the orbit.

If the sun was a black hole, it would be about 3 km, and Saggitarius A* has 4 000 000 times the mass of the sun, therefore it would have a diameter of 12 000 000 km.

Still less than earth`s orbit, d = 2 r = 150 000 000 km.

Singularities themselves don`t have a "size", because that doesn`t mean anything to a singularity. It doesn`t take up space. It`s infinitely dense. It`s literally smaller than the smallest possible thing can exist, because it`s a point, not a volume.

The only meaningful spatial boundary you can give to a black hole is its event horizon; the edge at which its gravitational pull is so great, light can`t escape it.

Technically, yes, the singularity is smaller than the sun. The black hole it resides in is very much a supermassive object.