Question

what is the big bang theory? how long ago did the big bang occur? identify the first element in the universe. how long after the big bang did stars begin to form? if we perceive the galaxies around us as red or orange, what does that mean about the expansion of the universe? is it still expanding, or has it stopped?

Explanation:

The Big Bang Theory is the leading cosmological model for the origin of the universe, positing it began from a singularity. Current estimates place the Big Bang around 13.8 billion years ago. The first element was hydrogen formed as the universe cooled. Stars began forming a few hundred million years after the Big Bang. Red - or orange - shifted galaxies indicate the universe is still expanding due to the Doppler effect for light.

Answer:

• The Big Bang Theory is the leading model for the origin of the universe from a singularity.
• Approximately 13.8 billion years ago.
• Hydrogen.
• A few hundred million years.
• The universe is still expanding as red - or orange - shifted galaxies show the Doppler effect for light indicating recession.