Spacewalking astronauts repaired and upgraded the famed Hubble Telescope during five missions from 1993 to 2009. Here's a ...

Space is massive, and in many areas, amazingly beautiful. We are fortunate to live in a time when humans are able to see at ...

In June 1990, NASA announced the discovery of a spherical aberration on Hubble's primary mirror due to a 2-micron mistake in the curvature of the ... well as some other, secondary hardware.

Telescopes Allow Visual Time Travel . It may sound like science fiction, but I'm not exaggerating when I say that telescopes allow you to look back in time. The James Webb Space T ...

In order to meet the above requirements, the optical system of the inter-spacecraft laser interferometry telescope generally adopts four-mirror optical structure. The coaxial four-mirror system ...

So let's kick things up a notch and jump right to the James Webb Space Telescope. That instrument's primary mirror is 6.5 meters across, which is so big it couldn't even fit inside of the rocket ...

You use an eyepiece on the side to look through a reflector telescope. These telescopes use primary and secondary mirrors to reflect light. Because light isn't forced to travel in a single, straight ...

A recent test demonstrated the ability of the telescope to fully deploy its shiny new mirror, which is one of the first things it’ll have to do after being sent to space, and before it can ...

The Indianapolis Colts added to the secondary in Round 3 of the 2025 NFL Draft, grabbing Minnesota cornerback Justin Walley.

How can you fairly compare one telescope to another? It's all in the (angular) resolution. The entire point of introducing telescopes into astronomy is to make distant things more visible.

Now, using the James Webb Space Telescope (JWST), astronomers may have cracked this puzzle, finding the first evidence of a supermassive black hole at the heart of M83, also known as NGC 5236 ...