If watery plumes do burst from Europa’s surface, they might originate not in the moon’s underground ocean, but instead in pockets of brine trapped in the moon’s crust. If that’s so, it could be a source of frustration for those who want to probe Europa’s ocean for possible life. Source: https://earthsky.org/space/jupiter-moon-europa-plumes-salty-water-in-crust…
Tag: asteroid impacts
Ancient life signs under dinosaur-killing Chicxulub crater
Researchers have found evidence for an ancient microbial ecosystem in a hydrothermal system beneath Mexico’s Chicxulub Crater, thought to be the site of the impact that killed the dinosaurs 66 million years ago. Source: https://earthsky.org/space/dinosaur-killing-chicxulub-impact-crater-hydrothermal-microbial…
The Yarkovsky effect: Pushing asteroids around with sunlight
The Yarkovsky effect is a minuscule push on a small body in space, imparted by nothing more than sunlight. Source: https://earthsky.org/astronomy-essentials/the-yarkovsky-effect-pushing-asteroids-around-with-sunlight…
Super-Earth exoplanets often have giant ‘Jupiter’ bodyguards
Planetary systems with both super-Earths and Jupiter-type planets may be common, according to a new study. As in our own solar system, the giant planets would act as “bodyguards” protecting the smaller planets from asteroid impacts. Source: https://earthsky.org/space/super-earth-exoplanet-giant-jupiter-bodyguard…
Truck-sized asteroid swept within 2,000 miles on Sunday
Asteroid ZTF0DxQ – now officially labeled 2020 QG – now holds the record for the closest flyby of Earth. It swept just 2,000 miles (3,000 km) from Earth’s surface, or about a quarter of the diameter of Earth itself. Source: https://earthsky.org/space/closest-known-asteroid-flyby-ztf0dxq-2020-qg…
When the sky exploded: Remembering Tunguska
On June 30, 1908, the largest asteroid impact in recorded history occurred in remote Siberia, Russia. We now celebrate Asteroid Day each year on the anniversary the Tunguska event, as it is now known. Source: https://earthsky.org/space/what-is-the-tunguska-explosion…
First global map of rockfalls on the moon
A research team from ETH Zurich and the Max Planck Institute for Solar System Research in Göttingen counted over 136,000 rockfalls on the moon caused by asteroid impacts. Even billions of years old landscapes are still changing. Source: https://phys.org/news/2020-06-global-rockfalls-moon.html…
Ancient asteroid impacts created the ingredients of life on Earth and Mars
A new study published in Scientific Reports reveals that asteroid impact sites in the ocean may possess a crucial link in explaining the formation of the essential molecules for life. The researchers discovered the emergence of amino acids that serve as the building blocks for proteins—demonstrating the role of meteorites in bringing life’s molecules to Earth, and potentially Mars. Source: https://phys.org/news/2020-06-ancient-asteroid-impacts-ingredients-life.html…
Did ancient Earth life escape our solar system?
You’ve heard of panspermia, the idea that life exists throughout space and was carried to Earth by comets? What if the reverse occurred, with microbes on Earth ejected into space by asteroid impacts, escaping into the solar system billions of years ago? Source: https://earthsky.org/space/microbes-from-earth-escape-solar-system-asteroid-impact-panspermia…
Small asteroid C0PPEV1 paid a heavy price for almost striking Earth yesterday
Earth’s gravity bent the trajectory of asteroid C0PPEV1 so much yesterday – as this asteroid swept only 3,852 miles (6,200 km) above Africa – that its farthest point from the sun has now shifted out to the asteroid belt between Jupiter and Mars. Source: https://earthsky.org/space/near-earth-asteroid-close-pass-oct-2019-c0ppev1…