The Dreamtime constellation of The Emu rises out of the glow of Sydney, 350km away from the Australian Astronomical Observatory. David Malin

Darkness is disappearing and that’s bad news for astronomy

Darkness is precious to astronomers, but it’s also good for everybody. We should ensure we preserve the dark by using the latest technologies responsibly.
Hubble fireworks.

Hubble in pictures: astronomers’ top picks

Astronomers from around the world identify their favourite images sent back to Earth by the Hubble Space Telescope.
A computer-generated artists impression of the thousands of objects in orbit around Earth. AFP

Space junk and the environment: it’s a very dark picture indeed

Since the launch of the first artificial satellite in 1957 – the Soviet Union’s Sputnik 1 – countries around the world have been putting satellites and spacecraft into Earth orbit. While the majority of…

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