What is His theory states that the earth is the center of the universe and everything revolves around it
100
Why do scientists study distant galaxies
What is to learn about the past
100
What type of galaxy is the sombrero galaxy
What is elliptical
200
The brightest rotating object in space
What is quasar
200
A loose group of stars
What is open cluster
200
______ is a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
What is nuclear fusion
200
Copernicus theory.
What is the earth rotates around the sun.
200
What type of galaxy is the Milky Way
What is spiral
300
Left over radiation that shows evidence of the Big Bang
What is cosmic background radiation
300
A star that is visible above the horizon at all times when in the poles
What is circumpolar stars
300
What prevents a machine from being 100% efficient
What is friction
300
The time at which the sun crosses the plane of the equator towards the relevant hemisphere
What is vernal equinox
300
A type of galaxy that has no clear characteristics
What is irregular galaxy
400
This object is so dense that not even light can escape.
What is black hole
400
Where do most stars appear on the hr diagram
What is main sequence
400
Newton's second law of motion-
What is Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
400
An electromagnetic wave of high energy with very short wavelength
What is X-ray
400
What is an increase in wavelengths
What is red. Shift
500
This diagram classifies stars by there heat and size.
What is the hr diagram
500
This type of telescope uses mirrors to collect and focus light
What is reflecting
500
What will happen to the universe according to scientists
What is eventually all the stars will die and the universe will be cold and empty