telescope

By linking signals from these observatories, they effectively created a virtual telescope five times wider than Earth's diameter.

Since then, astronomers have used ground-based and space telescopes to monitor its progress and discover more about it.

When astronomers use telescopes to look at galaxies in space, they find some that are close by and further away—that is, some younger and some very much older.

Nothing, not even light, can escape a black hole, making it completely invisible to telescopes.

This instrument is mounted on the Gemini North telescope in Hawai'i.