When blue light is emitted from a source

When an object is moving towards an observer, the light emitted from the object is shifted to the blue part of the spectrum

When an object is moving towards an observer, the light emitted from the object is shifted to the red part of the spectrum

There is no such thing as blue shift

If scientists find new evidence that doesn’t support the Big Bang Theory, what should other scientists do?

Ignore the evidence and keep on believing what they always have

Test the evidence to ensure that it is reproducible

How do we know black holes exist if we cannot see them?

They emit a very specific type of radiation

Objects near them orbit around them

The faster a star or galaxy is moving (relative to us), we say that the redshift is …

There is no correlation between speed and size of red-shift

How do we know that the Universe is currently expanding?

Light waves from distant galaxies are shifted so that they appear redder than they normally would

Light waves from distant galaxies are shifted so that they appear bluer than they normally would

Gamma waves from distant galaxies are shifted so that they appear redder than they normally would

Delta waves from distant galaxies are shifted so that they appear redder than they normally would

'In space no one can hear you scream' was a famous movie quote, but is that actually true and why?

It is true. Sound waves need particles to vibrate to travel. In space, particles are few and far between so sound cannot travel through space

It is not true, but we don't know why

It is true. Space is too cold for sound waves to travel

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