From BBC News:
A Nasa spacecraft has sent back historic first pictures of an unexplored region of Mars.
The Mars Phoenix lander touched down in the far north of the Red Planet, after a 680 million-km (423 million-mile) journey from Earth.
The probe is equipped with a robotic arm to dig for water-ice thought to be buried beneath the surface.
It will begin examining the site for evidence of the building blocks of life in the next few days.
A signal confirming the lander had reached the surface was received at 2353 GMT on 25 May (1953 EDT; 0053 BST on 26 May).
Engineers and scientists at Nasa's Jet Propulsion Laboratory in California clapped and cheered when the landing signal came through.
"Phoenix has landed - welcome to the northern plain of Mars," a flight controller announced.
Hubble Space Telescope