Nasa spacecraft crashes into Mercury

This artist's rendering provided by the Johns Hopkins University Applied Physics Laboratory shows Messenger. Photo / AP

An unmanned Nasa spacecraft has crashed on the surface of the planet Mercury, after it ran out of fuel following a successful 11-year mission, the US space agency says.

The MESSENGER probe - short for MErcury Surface, Space ENvironment, GEochemistry, and Ranging - was the first spacecraft to orbit Mercury, and issued a final farewell on Twitter shortly before its demise at 1926 GMT.

This artist's rendering provided by NASA shows the Mercury Surface and Messenger spacecraft. Photo / AP

"Well, I guess it's time to say goodbye to all my friends, family, support team. I will be making my final impact very soon."

Shortly after, the official @MESSENGER2011 Twitter account posted another image of Mercury's surface, with the caption: "MESSENGER's LAST ACT? THAT'S SMASHING!"

#thatsmessenger pic.twitter.com/NPK4zqtNPM

— MESSENGER (@MESSENGER2011) April 30, 2015

The image was not of Mercury's fall. Nasa has said previously that there could be no real-time pictures of the impact, which would take place on the side of the planet facing away from the Earth.

But the US space agency confirmed that the probe had indeed crash-landed.

"A Nasa planetary exploration mission came to a planned, but nonetheless dramatic, end Thursday when it slammed into Mercury's surface at about 8,750 miles per hour (3.91 kilometres per second) and created a new crater on the planet's surface," the agency said in a statement.

The spacecraft itself was just about three metres long.

The mission, which launched in 2004, had achieved "unprecedented success", with its top discovery being that Mercury had lots of frozen water and other volatile materials in its permanently shadowed polar craters on the planet closest to the Sun, the US space agency said.

-AAP