Historically, spaceflight has been reserved for the very healthy. Astronauts are selected for their ability to meet the highest physical standards to prepare them for any unknown challenges. However, with the advent of commercial spaceflight, average people can now fly. The aerospace medicine community has had little information about what medical conditions should be considered particularly risky in the spaceflight environment, as most medical conditions have never been studied for risk in space -- until now.
Astronomers have discovered that an ultracompact dwarf galaxy harbors a supermassive black hole – the smallest galaxy known to contain such a massive light-sucking object. The finding suggests huge black holes may be more common than previously believed.
U.S. astronauts once again will travel to and from the International Space Station from the United States on American spacecraft under groundbreaking contracts NASA announced Tuesday. The agency unveiled its selection of Boeing and SpaceX to transport U.S. crews to and from the space station using their CST-100 and Crew Dragon spacecraft, respectively, with a goal of ending the nation's sole reliance on Russia in 2017.
For decades scientists have believed that galaxy mergers usually result in the formation of elliptical galaxies. Now, for the the first time, researchers have found direct evidence that merging galaxies can instead form disc galaxies, and that this outcome is in fact quite common. This surprising result could explain why there are so many spiral galaxies like the Milky Way in the Universe.
Rosetta mission managers choose a site for the historic first landing on the comet. Also; NASA's Curiosity rover arrives at its final destination at the Martian peak Mount Sharp, and a new Australian telecommunications satellite launches into orbit.
A new catalog of the visible part of the northern part of our home Galaxy, the Milky Way, includes no fewer than 219 million stars. From dark sky sites on Earth, the Milky Way appears as a glowing band stretching across the sky. To astronomers, it is the disk of our own galaxy, a system stretching across 100,000 light-years, seen edge-on from our vantage point orbiting the Sun. The disk contains the majority of the stars in the galaxy, including the Sun, and the densest concentrations of dust and gas.
New clues to how giant elliptical galaxies move have been discovered by an international team of astronomers. Elliptical galaxies have long been considered as essentially being made up of old stars that move randomly within them, like a swarm of bees. This has been challenged in many instances in the past ten-twenty years, but giant elliptical galaxies are still considered as a nearly round and non-rotating group of old stars by astronomers.