end of the universe

Question 1

speed of universe’s expansion

Answer 1

accelerating

Question 2

two forces acting on galaxies

Answer 2

1. gravity
2. universal expansion

Question 3

proof of dark matter

Answer 3

most galaxies appear to contain far less mass than they actually do, which can be seen from their movements under gravity
- therefore unknown, undetectable matter is spread throughout the universe, only detected through gravity

Question 4

big freeze

Answer 4

universe continues to grow and expand at the same accelerated rate forever
- energy is spread too far out and temperature drops to absolute zero
- nothing will ever happen again
- heat death of the universe

Question 5

big rip

Answer 5

if there is enough dark energy, the universal acceleration rate will increase over time
- positive jerk(rate of acceleration) = expansion becomes too fast for matter to stay together
- eventually space-time will fall apart and the expansion rate becomes infinite

Question 6

big crunch

Answer 6

the universe’s expansion slows down and ultimately contracts and pushed everything in the universe together
- reversal of the big bang into a singularity

Question 7

big bounce

Answer 7

singularity created by the big crunch will re-explode into another big bang
- cycle goes on indefinitely

Question 8

steady state

Answer 8

dark energy + gravity will reach equilibrium
- universe reached max size and stops expanding
- though very unlikely