Aeff is the effective collecting area of the telescope, σ is the instrumental or atmospheric seeing or the pixel-size, whichever dominates, tE is the exposure time, and tD is the dead time. In this ...

Astronomers warn that proposed changes to the space observatory's operational budget could decrease the amount of ...

Venus, Mars, Jupiter and Saturn parade through our skies this January. The best telescopes for seeing planets can help you spot them! This January there are plenty of planetary events to observe ...

Christmas is a great time to look for a telescope for your budding amateur astronomer. But there are some things to keep in ...

(For more on the controversy Galileo spawned, see His Big Mistake.) Building a better refractor The spyglass-turned-telescope had limitations, some of which Galileo was able to design around.

Orbital telescopes function as eyes in the sky that allow astronomers to peer farther into the universe and see the cosmos more clearly. Scientists began dreaming of such a telescope in the 1940s ...

Because planets always appear in a line, the alignment isn't anything out of the norm. What's less common is seeing so many ...

"This is how you solve the universe-breaking problem." ...

Astronomers have released a set of more than a million simulated images showcasing the cosmos as NASA's upcoming Nancy Grace ...