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New study sheds light on the origins of Earth and Mars

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A team of researchers from Denmark, Sweden and China has published a new study in Nature that reveals the composition and formation of the two most habitable planets in the Solar System: Earth and Mars. The study is based on the analysis of silicon isotopes, which are variations of the same element with different numbers of neutrons, in different types of meteorites. Silicon is the most abundant refractory element in rocky planets, and its isotopic composition can trace the origin and evolution of planetary building blocks. The researchers found that Earth and Mars have distinct silicon isotopic signatures that differ from those of chondrites, which are primitive meteorites that represent the undifferentiated material of the early Solar System. This means that chondrites are not the main source of material for terrestrial planets, as previously thought. Instead, the study suggests that Earth and Mars were formed from material similar to early-formed differentiated asteroids, which are...
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NASA's MAVEN spacecraft reveals stunning ultraviolet views of Mars

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NASA's MAVEN (Mars Atmosphere and Volatile EvolutioN) mission has acquired stunning views of Mars in two ultraviolet images taken at different points along our neighboring planet's orbit around the sun. The images show how the Martian atmosphere responds to changes in seasons and solar activity. They also reveal the diversity of clouds and ozone in the upper atmosphere. © NASA/LASP/CU Boulder MAVEN is the first spacecraft dedicated to exploring the tenuous upper atmosphere of Mars. The mission's combination of detailed point measurements and global observations provides a powerful way to understand the properties of the upper atmosphere¹. MAVEN's Imaging Ultraviolet Spectrograph (IUVS) instrument captured the remarkable ultraviolet views. According to NASA, the instrument has been designed to measure ultraviolet wavelengths ranging from 110 to 340 nanometers, which fall outside of the visible range. One image was taken in July 2022, during the southern hemisphere's ...
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Hubble reveals the dazzling stars of NGC 6544

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  The NASA/ESA Hubble Space Telescope has captured a stunning image of the globular cluster NGC 6544 , a dense swarm of tens of thousands of stars that lies more than 8000 light-years away from Earth in the constellation Sagittarius . Globular clusters are ancient relics of the early universe, containing some of the oldest stars in the galaxy. They orbit around the center of the Milky Way, forming a spherical halo that extends far beyond the galactic disk. NGC 6544 is one of the closest globular clusters to the galactic plane, making it an interesting target for astronomers who want to study its origin and evolution. The image of NGC 6544 combines data from two of Hubble's instruments — the Advanced Camera for Surveys and Wide Field Camera 3 — as well as two separate astronomical observations. The first observation was designed to find a visible counterpart to the radio pulsar discovered in NGC 6544. A pulsar is the rapidly spinning remnant of a dead star, emitting twin beams of e...
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