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Articles on NASA

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Astronomers have found a way to estimate the number of stars in the universe. Comstock Images via Getty Images

How many stars are there in space?

Scientists have a good estimate on the staggering number of stars in the universe.
The James Webb Space Telescope is the biggest orbital telescope ever built and is scheduled to be launched into space on Dec. 18, 2021. NASA/Desiree Stover

James Webb Space Telescope: An astronomer on the team explains how to send a giant telescope to space – and why

The largest orbital telescope ever made will allow astronomers to study the atmospheres of alien planets, learn about how stars form in the Milky Way and peer into the farthest reaches of the universe.
Mars northern polar cap, photographed by the NASA Mars Reconnaissance Orbiter mission. NASA/JPL-Caltech/MSSS

Why is there so little water left on Mars?

New results show why and how water is disappearing from Mars atmosphere.

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