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Samples from a rare meteorite family, including the one shown here, reveal that their parent planetesimal, formed in the earliest stages of the solar system, was a complex, layered object, with a molten core and solid crust similar to Earth.

Seismic noise is measure by seismometers. These are sensitive scientific instruments to record vibrations travelling through the ground – known as seismic waves. Traditionally, seismology focuses on measuring seismic waves arising after earthquakes. Seismic records from natural sources however are contaminated by high-frequency vibrations (“buzz”) from humans at the surface – walking around, driving cars, public transport, heavy industry and construction work all create unique seismic signatures in the subsurface that are recorded on seismometers. The buzz is stronger during the day than at night and weaker on weekends than weekdays.

These images the JIRAM instrument aboard NASA's Juno spacecraft took on Dec. 26, 2019, provide the first infrared mapping of Ganymede's northern frontier. Frozen water molecules detected at both poles have no appreciable order to their arrangement and a different infrared signature than ice at the equator.

First ever image of a multi-planet system around a Sun-like star

A Special Family Portrait

Letting a satellite breathe

Copernicus Sentinel-6 Michael Freilich.

The Mobile Base System moves on the Mobile Transporter rail car along truss rails covering the length of the space station. It provides a movable platform for Canadarm2 and Dextre and can access any of eight worksites that feature power connections.

Number of sources as a function of Galactic longitude in each of the six pass bands, with Sloan i < 20.5 magnitudes.