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

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

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

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

A) False
B) True

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

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

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

A) False
B) True

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