NASA

Picture of the dwarf planet Ceres taken by the Dawn space probe (Image NASA/JPL-Caltech/UCLA/MPS/DLR/IDA)

NASA’s space probe Dawn continues its approach to the dwarf planet Ceres. This allows to send on Earth better and better photographs with greater details of its surface. The previous images were clear enough to make it possible to see some light-colored areas and in particular a really bright one, which had puzzled scientists. A photo taken on February 19 at a distance of about 46,000 km (about 29,000 miles) shows a second bright area close to the one already identified.

Image of the SOHO space probe showing the comet C/2015 D1 (SOHO) near the Sun (Image ESA/NASA/SOHO/Hill)

The SOHO (Solar and Heliospheric Observatory) space probe has the primary purpose of keeping an eye on the Sun but when a comet passes close to our star is also useful to track its trajectory. Last week, SOHO identified a new comet because passing near the Sun it’s become bright enough to be detected.

This comet was originally called SOHO-2875 because in the course of over 19 years of mission in a collaboration between ESA and NASA this is the 2875th comet identified by the SOHO space probe. Subsequently officially named C/2015 D1 (SOHO), it survived a flyby with the Sun and may also be visible from Earth in the coming weeks.

The MAVEN space probe during its test phase at Kennedy Space Center (Photo NASA/Jim Grossmann)

NASA’s MAVEN space probe successfully completed the first of five deep-dip maneuvers into the depths of Mars atmosphere. The purpose was to gather measurements closer to the lower limit of the upper layer of the red planet’s atmosphere. The periapsis, which is the lowest altitude point of the orbit, reached by MAVEN was 125 kilometers (78 miles).

The purpose of the space probe MAVEN (Mars Atmosphere and Volatile Evolution), which reached the orbit of Mars on September 21, 2014, is precisely to study the red planet’s atmosphere. It’s much thinner than Earth’s one but is still a complex system. To understand its dynamics and its evolution over time, MAVEN is making continuous measurements and during the month started plunging into its depths.

Two pictures of Ceres taken by NASA's space probe Dawn (Image NASA/JPL-Caltech/UCLA/MPS/DLR/IDA)

NASA’s Dawn spacecraft is approaching the dwarf planet Ceres. On February 12, 2015, when it was at a distance of about 83,000 kilometers (about 52,000 miles), it took some pictures that show us Ceres with a quality never seen before, allowing us to see its craters. The photos taken previously had puzzled scientists for the presence of some white spots but the new images don’t solve the mystery.

A comparison of the map of Ligeia Mare on Titan before and after the application of despeckling (Image NASA/JPL-Caltech/ASI)

Since July 2014, NASA’s space probe Cassini has been accomplishing its mission exploring Saturn and its moons, including Titan. Its SAR (Synthetic Aperture Radar) instrument allowed to map almost half of the surface of this satellite, allowing to know its geological features like never before. Now these surveys can offer even more details thanks to a new technique that improves their quality.

The images created thanks to the Cassini space probe’s SAR are “grainy”, like photographs of limited quality. Scientists must strive to interpret the smaller geological features or to identify changes in images of the same area taken at different times. The new technique called despeckling by its developers is improving the situation.