Science round-up: Nasa’s Orion test, ancient engravings, Blu-ray solar panels and hairy mouths for mating

The United Launch Alliance Delta 4 rocket carrying NASA's first Orion deep space exploration craft takes off from its launchpad. - AFP

Manned flights to Mars could become a reality within the next two decades.

Nasa has announced plans to send astronauts to Mars in the 2030s, and has completed the first test flight of Orion – its newest spacecraft built to carry humans.