13 years ago
CiCi

what does it mean that quasars are most common at a redshift of about 2?

what does it mean that quasars are most common at a redshift of about 2?
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13 years ago
Horatio
Favorite Answer
According to the source link I posted below, "Scientists measure cosmic distances via redshift, the extent to which light is "shifted" towards the red (lower energy) part of the electromagnetic spectrum during its long journey across the universe. The greater the distance, the higher the redshift." A designation of redshift 2 is equivalent to 10 billion light years. Therefore, "quasars are most common at a redshif of about 2" means that most known quasars are approximately 10 billion light years from earth.
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