Mercedes AMG Petronas Formula One driver Britain's Lewis Hamilton poses by the new 2017 season Mercedes W08 EQ Power+ Formula One car at its launch event at Silverstone motor racing circuit near Towcester, central England on February 23, 2017. / AFP PHOTO / OLI SCARFF
© Copyright Agence France-Presse (AFP) - All Rights Reserved
Auto, Horizontal, Panoramic, Topshots
Milky Way. Mosaic of photographs of the Milky Way, the spiral galaxy in which our solar system lies. Our Sun is believed to be around two-thirds of the way out from the centre in a small spiral arm. Galactic Centre lies at the centre of the image in the constellation Sagittarius. This is where the bulge of stars in the Milky Way is at its greatest, tapering away on either side. The image runs around the whole of the sky, so our view away from Galactic Centre is seen both at far left and at far right. Interstellar dust obscures much of the Galaxy's central axis. The Milky Way is thought to be about 120, 000 light years across and to contain over 100 billion stars.
© ECKHARD SLAWIK/SCIENCE PHOTO LIBRARY
Nuclear-powered spacecraft, artwork
Nuclear-powered spacecraft at Ganymede, computer artwork. Ganymede is one of the moons of Jupiter. The spacecraft is powered by nuclear fusion, the same process that takes place in the Sun. This is a cleaner source of energy than nuclear fission, though it is thought it will take many years to develop controlled nuclear fusion reactors. Travel to the outer planets, which involves much greater distances and travel times than for travel to the inner planets and the Moon, will probably require nuclear fusion. The crew's living quarters are at right, away from the nuclear propulsion systems at left. This minimises the exposure of the crew to dangerous radiation from the nuclear reactor.
© CARL GOODMAN/SCIENCE PHOTO LIBRARY