Black Holes

Front

If a dying star's core is less than 1.4 times the mass of the Sun, it becomes ___

Back

a white dwarf

Front

If a dying star's core is between 1.4 and 2.8 times the Sun's mass, it becomes ___

Back

a neutron star

Front

If a dying star's core is more than 2.8 times the Sun's mass, it becomes ___

Back

a black hole

Front

For Earth, the escape velocity is about ___

Back

11 km per second

Front

A neutron star, with its immense gravity, can have an escape velocity that's up to ___

Back

half the speed of light

Front

Nothing can escape, not even light, once the core of a neutron star shrinks down to ___ (Options: roughly 1.8 km, roughly 8.1 km, roughly 18 km, roughly 81 km)

Back

roughly 18 km

Front

The surface around a black hole, where the escape velocity is the speed of light, is called ___

Back

the event horizon

Front

To become a black hole, the original star must have a mass of ___

Back

more than 20 times the Sun's mass

Front

If you could turn the Sun into a black hole, then the Earth would ___

Back

orbit it pretty much exactly as it does now

Front

The strength of gravity you feel from an object depends on ___

Back

how massive it is and your distance from its center