Unusual arms, revealed in x-ray light, dive through the plane of NGC 4258, ejecting enormous amounts of gas and choking the ability for new stars to form. Astronomers estimate that most of the gas needed for star birth will be ejected from the galaxy in 300 million years.
Credit: NASA/CXC/A. Hobart
A simulation of gravitationally interacting dark matter particles in the Universe shows the stringy nature of dark matter, peppered with voids, over the largest distance scales.
Today marks the 45 anniversary. Astronaut Buzz Aldrin, lunar module pilot of the first lunar landing mission, poses for a photograph beside the deployed United States flag during an Apollo 11 Extravehicular Activity (EVA) on the lunar surface. The Lunar Module (LM) is on the left, and the footprints of the astronauts are clearly visible in the soil of the Moon. Astronaut Neil A. Armstrong, commander, took this picture with a 70mm Hasselblad lunar surface camera. While astronauts Armstrong and Aldrin descended in the LM, the “Eagle”, to explore the Sea of Tranquility region of the Moon, astronaut Michael Collins, command module pilot, remained with the Command and Service Modules (CSM) “Columbia” in lunar-orbit.
Source: Apollo 11: Buzz Aldrin and the U.S. flag on the Moon (Smithsonian National Air and Space Museum)