Things in the Universe
What is at the centre of a solar system?
A star
What is a star?
A massive ball of hot, glowing gases
What do we call the hot, dense point where the expansion of the Big Bang started?
Singularity
How long does it take for light from the Sun to reach Earth? (closest minute)
8 minutes
How many stars are in our solar system?
1 - The Sun
What is the closest star to Earth?
The Sun
Where are stars born?
In a nebula
How long ago was the Big Bang?
(nearest billion)
14 billion (13.8 billion)
What is a light year?
The distance that light can travel in a year
Objects with more mass have more gravitational force. Which object would have the most amount of gravity?
a) Earth
b) Jupiter
c) The Sun
d) The Moon
c) The Sun
A planet is a large celestial body which orbits a star.
What is a moon?
A body which orbits a planet
When a massive star dies it explodes. What is this called?
Supernova
The Big Bang was not an explosion. Rather it was...
A sudden and rapid expansion
How many light years away is Proxima Centauri? (closest star to the Sun)
a) 1.004 light years
b) 4.246 light years
c) 28.646 light years
d) 4 trillion light years
b) 4.246 light years
Explain why black holes are black
A black hole has so much gravity and attracts so much that even light can not get out. Light has been absorbed = they cannot be seen
What do we call a group (hundreds or thousands) of galaxies, held together by gravity?
Galaxy cluster
Nuclear fusion - Hydrogen
Name 2 pieces of evidence that scientists have for the Big Bang Theory
Red-shift - Cosmic Background Radiation - Abundance of Light Elements
How fast can light travel? (km/s)
300 000 km/s
In what year did man walk on the moon?
1969
What is the name and shape of the galaxy we live in?
Milky Way - Spiral
Our Sun is an average sized star. At the end of its life what will it become?
White dwarf
Describe Hubble's Law
The universe is expanding. Galaxies further away from us are expanding at a faster rate than closer galaxies.
What Effect allows scientists to determine how far away a star/galaxy is?
Stellar Parallax Effect
Demonstrate the Doppler Effect in sound waves (with sound effects)
High pitch = Moving towards you
Low pitch = Moving away from you