What is red shift?
The time when a star moves from the main sequence to be a red giant
The red filter used by astronomers to analyse the light from distant stars
The increase in wavelength of light from a distant galaxy moving away from Earth
How many galaxies show a red shift?
Zero
Only a few of the most distant galaxies
Nearly all galaxies
What does a larger red shift indicate?
The galaxy has more stars
The galaxy is moving away faster
The star is about to explode in a supernova
More distant galaxies show more red shift. Which major theory does this support?
Theory of stellar evolution
The existence of galaxy clusters
The Big Bang theory
What is the basic idea of the Big Bang theory?
The Universe expanded from a single tiny point, starting about 13.8 billion years ago
The Universe will end in a giant dark energy explosion
The Solar System began when a protostar started nuclear fusion reactions
What feature is believed to be the thinly spread remains of energy released in the Big Bang?
Red shift
Light energy
Cosmic microwave background radiation
Why do scientists believe in the Big Bang theory?
Its predictions are supported by observations
It was one of the first scientific ideas to explain the beginning of the Universe
They can see it happening in supernova explosions
What does the Steady State theory suggest?
The Universe began 13.8 billion years ago, and is expanding, creating matter all the time
The Universe has always existed and is expanding, creating matter all the time
The Universe has always existed and is a constant size
What evidence does not support the Steady State theory?
What is NOT a problem for telescopes on satellites?
Some parts of the EM spectrum are absorbed by the atmosphere
Bad weather
Maintenance requires a manned space mission