A) electromagnetism
B) Nuclear bonding
C) Nuclear fusion
D) Gravity
E) all the answers

A) by viewing black holes with powerful telescopes
B) All of these answers
C) by running experiments on the Sun
D) by observing objects and light around black holes

A) when asteroids hit stars
B) when giant stars explode
C) when nuclear bombs explode
D) when comes strike planets

A) at the center of the solar system
B) In the center of a planet
C) at the center of galaxies
D) Inside gas giant planets

A) True
B) False

A) pulsar
B) Supernova border
C) Event horizon
D) singularity

A) Pulsar
B) singularity
C) Supernova
D) Iris

A) supernova
B) pulsar
C) singularity
D) iris

A) True
B) False

A) it's small size and large mass
B) It spins at a rate faster than light
C) It's large size and small mass
D) Nuclear reactions at its core