Nasa’s Maven spacecraft has arrived at Mars after a 442m-mile journey that began nearly a year ago.

Spacewalkers’ hi-tech tools proved ineffective when it came to dislodging a bolt interfering with repairs at the Hubble Telescope.

The primary camera on the Hubble Space Telescope has shut down and is likely to be only marginally restored, Nasa said, a collapse one US astronomer called a "great loss".

A Romanian man has been indicted on charges of hacking into more than 150 US government computers, costing Nasa, the Energy Department and the Navy nearly $1.5m (€1.1m).

The Northern Hemisphere has been getting greener, according to researchers studying satellite data.