Before 1999, astronomers had estimated that the age of the universe was between 7 and 20 billion years.

With these parameters, astronomers can also estimate the age of the star.

Astronomers have estimated that the entire universe numbers only about 10 to the 20th power stars.

About how much longer do astronomers estimate that the Sun will last before it uses up its fuel?

Astronomers estimate that the Sun will be 33% more luminous three billion years from now.

Astronomers have estimated that there are more than 1,000.

Astronomers estimate that the black holes will merge in another billion years.

Astronomers estimate that at least 90 percent of the mass in the universe has yet to be observed directly.

Astronomers estimate that the cluster has approximately 500-1,000 stars, all of which are around 100 million years old.

Astronomers estimate that half a million bodies larger than 20 miles wide are floating out there.