16.8 trillion ago
2 years ago
13.7 billion ago
14.8 billion ago
True
False
All the substance in the solar system
All the substance in our Galaxy
Everything that exists
The Earth and the Moon together
True
False
Red things get hotter
Hot things get redder
The object is moving slowly towards us
The object is moving quickly away from us
The temperature of the stars
The amount of mass present
The colour of the stars
The amount of trees on mars
They produce more red light than nearby galaxies.
They are moving away from us
Because light in outer space is red
The longer wavelengths are filtered out by dust