Mercury has a solid inner core: New evidence

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Scientists have long known that Earth and Mercury have metallic cores. Like Earth, Mercury's outer core is composed of liquid metal, but there have only been hints that Mercury's innermost core is solid. Now, in a new study, scientists report evidence that Mercury's inner core is indeed solid and that it is very nearly the same size as Earth's solid inner core.
via Science Daily
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Powerful particles and tugging tides may affect extraterrestrial life

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Two new studies, one on high-energy particles and the other on tidal forces, may bring into question the habitability of TRAPPIST-1 exoplanets.
via Science Daily
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Five planets revealed after 20 years of observation

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To confirm the presence of a planet, it is necessary to wait until it has made one or more revolutions around its star. This can take from a few days for the closest to the star to decades for the furthest away. Only a telescope dedicated to the search for exoplanets can carry out such measurements over such long periods of time, which is the case of the EULER telescope of UNIGE.
via Science Daily
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How to defend the Earth from asteroids

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The Chelyabinsk meteor caused extensive ground damage and numerous injuries when it exploded on impact with Earth's atmosphere in 2013; to prevent another such impact, scientists plan to use a simple yet ingenious way to spot tiny near-Earth objects.
via Science Daily
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