On the Webb telescope, 18 hexagonal mirrors combine to form a massive primary mirror that is 21 feet (6.5 meters) across. The ...

Unpredictable bursts of light are pulsing from the debris surrounding Sagittarius A*, offering new insights into the ...

Astronomers say the asteroid, estimated at 40-90 m (131-295 ft.) in diameter, could impact Earth on Dec. 22, 2032. “It is ...

The James Webb Telescope ... The Nancy Grace Roman Telescope: Why is it revolutionary? Named after NASA’s first Chief of Astronomy, the Nancy Grace Roman Telescope is a big deal. Its 2.4-meter-wide ...

The Webb telescope is well-suited to identify asteroid 2024 YR4's size. Webb views a type of light we can't see with the ...

In a rare "time-critical" decision, the James Webb Space Telescope will study the true size of the "potentially hazardous" asteroid 2024 YR4 twice over the next few months. The asteroid has a ...

Humanity's most powerful space telescope is setting its sights on the most dangerous known asteroid in the solar system. However, 2024 YR4's current size is just an estimate based on ground ...

The exoplanet, discovered in 2009, remained elusive due to dense clouds. Now, scientists have peered through with the James ...

The chances of an asteroid hitting the Earth with enough force to destroy a small country have been increased to 1 in 43.

The director of the Space Telescope Science Institute, which runs the James Webb Space ... better sense of its size, Rivkin explained. And the Webb telescope — with mirrors over 21 feet across ...