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Image of the day

Glorious Sunrise at the Start of a Spacewalk NASA astronaut Mark Vande Hei exits the International Space Station on Oct. 10, 2017, for a spacewalk in this photograph taken by fellow spacewalker Randy Bresnik. Bresnik wrote, "A glorious sunrise greeted @Astro_Sabot and I at the start of our 2nd #spacewalk. His visor reflection shows the airlock hatch we came out."

Icarus lifts off

Launch of a Soyuz 2-1A from the Cosmodrome in Baikonur. A rocket of this type has now brought the first Icarus component to the ISS. In future, it will be responsible for decoding the signals received by the Icarus antenna and separating the different data streams from each other. © dpa

How Bright is the Moon, Really?

Moonset on the NIST campus. These white domes will house the equipment used in the Moon brightness experiment. Eventually the domes and equipment will be moved to the Mauna Loa Observatory in Hawaii. Credit: Jennifer Lauren Lee/NIST

Hubble’s Compact Galaxy with Big-Time Star Formation

As far as galaxies are concerned, size can be deceptive. Some of the largest galaxies in the Universe are dormant, while some dwarf galaxies, such as ESO 553-46 imaged here by the NASA/ESA Hubble Space Telescope, can produce stars at a hair-raising rate. Credit: ESA/Hubble & NASA. Text credit: European Space Agency