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Dwarf or planet? First visit to Pluto could reignite the row

10 June 2015

How many solar system planets are there: eight, nine? Or 73 or 74? Arguments swirl on nine years after Pluto was struck off the official list

First visit to Pluto could rewrite the solar system's story

10 June 2015

Rivers of neon, geysers of nitrogen, an oddly giant moon: the New Horizons probe promises revealing spectacles – and insights into deep solar system history

Giant telescope in Hawaii gets go-ahead, if others shut down

3 June 2015

Protests over the construction of the Thirty Meter Telescope on Mauna Kea halted its progress. Now construction is back on, but three other scopes will have to close

Pluto's strange family of moons are locked in a mysterious waltz

3 June 2015

Three of Pluto's four small moons are moving in step, and the fourth looks darker than the rest – creating a puzzle as to how they formed

How we've got to know Pluto

29 May 2015

60 Seconds

13 May 2015

Ceres yields secrets, Shell's Arctic victory, Liberia free of Ebola and more

Rosetta's wrong water could be right after all

6 May 2015

Comet 67P's water isn't like Earth's – it's interstellar stuff, from the same mould as the pristine material that made the solar system

Land ho: NASA spacecraft may have seen polar ice cap on Pluto

30 April 2015

NASA's New Horizons spacecraft is 98 per cent of the way to Pluto, and it's getting better pictures than Hubble

The human universe: If aliens exist, do they know we're here?

29 April 2015

Extraterrestrials could already be learning about life on Earth. Problem is, it's probably from TV signals transmitted in 1973…

Today on 91av

17 April 2015

All the latest from newscientist.com: how colour vision made us human, Ceres glows in the sunlight, dogs bonding with humans, and more