What is the period of rotation around the pole star.
One night
100
What is a light year?
The DISTANCE travelled by light in one year
200
What is Dark Matter?
Generic name for matter in galaxies and clusters of galaxies that is too cold to radiate. Its existence is inferred from techniques other than direct visual observation.
200
What is the furthest planet from the Sun?
Neptune
200
What is the definition of a Contellation?
A group of stars in a recognizable pattern that appear to be near each otehr in space.
200
What is a galaxy?
A large collection of stars held together by their mutual gravity.
300
What is Main Sequence Star?
A normal star that is undergoing nuclear fusion of hydrogen into helium. Our Sun is an example of this.
The stars in a constellation only appear to be close. (What we see on a "flat" sky)
300
Which planets are small and rocky?
Which planets are large and mainly gas?
Inner Planets
Outer Planets
400
What is Interstellar Medium?
Gases (mainly hydrogen and helium) and dust grains (silicates, carbon and iron) filling the space in between stars. The density of this is very low.
400
Where is the Asteroid Belt?
In between Mars and Jupiter
400
What is the definition of a Stellar Cluster?
A group of stars that are physically near each other in space, created by the collapse of the same gas cloud.
400
What is a parsec?
One parsec is 3.26 light years
500
What is Cepheid Variable?
A star of variable luminosity. The luminosity increases sharply and falls off gently with a well defined period. The period is related to the absolute luminosity of the star and so can be used to estimate the distance of the star.