When we see the Andromeda galaxy, we are seeing it as it was 2.3 million years ago. Why?
Which does the existance of cosmic background radiation support?
which would cause the universe to collapse in on itself to make a closed universe?
Our galaxy is called
Which type of galaxy is illustrated?
According to latest theories, the Big Bang happened
What is the origin of the cosmic background radiation?
In the Big Bang model, which describes a universe that will stop expanding and begin to contract?
Our Sun is just one of many millions of stars in a froup of stars called a
What was in part of the Milky Way prior to 4.6 billion years ago?
The light from most distant galaxies is ____.
Which galaxy shape is not a part of Hubble's classification system?
the study of cosmology is concerned with
the Milky Way contains a large central bulge made up mostly of
Which scientist was the first to find evidence that the universe is expanding
At what time point in the Universe's history did all the forces in nature appear along with particles, neutrons, protons, and electrons?
Edwin Hubble's discoveries were so important that he had something named after him.
What was it?
Because light takes time to travel through space, we see objects as they were when the light was given out, not as they are now.
The unit of length that astronomers use is the
Our universe is made up of at least a