*Post by s***@gmail.com*Consider a black hole with a mass of 4 x 10^20 Kg

The radius would be about 594 nanometers

The temperature would be about 92.6 degrees F

the surface gravity (a force) would be about 7.6 x 10^22 m/s^2

it would last a long time, say 1.7 x 10^38 years

Luminosity would be dim dim dim at 2.22 x 10-9 Watt

So, how close could you get without being sucked in?

you will always get sucked in at any distance,

unless you have a powered space ship to provide acceleration away from it.

so, the solution is a curve on a 2d axis of power or acceleration

required distance. (what is missing is the distance and how much

acceleration you have for a specific answer)

What would be a safe distance?

none! unless you can generate 1g all the time... etc.

*Post by s***@gmail.com*Perhaps you could estimate using Newton's inverse square law.

interesting in the movie intersteller, was time slowing down on a planet

surface near a black hole... (excellent movie)

would that affect the amount of accelleration you need over a time

interval to get away from a black hole ?