Saturday, January 18, 2020

Shocked Meteorites Provide Clues to Earth’s Lower Mantle

A fragment of the Suizhou meteorite analyzed for this study, indicating the shock veins in which the team discovered bridgmanite together with metallic iron nanoparticles.  Image by Xiande Xie/Guangzhou Institute of Geochemistry

Deep below the Earth's surface lies a thick rocky layer called the mantle, which makes up the majority of our planet's volume. While Earth's mantle is too deep for humans to observe directly, certain meteorites can provide clues to this unreachable layer.

Sunday, December 29, 2019

Asteroid Collisions Trigger Cascading Formation of Subfamilies, Study Concludes

Researchers at São Paulo State University identify groups of asteroids created by rotational fission inside collisional families (image: Safwan Aljbaae).

Elton Alisson | Agência FAPESP – Billions of years ago, asteroid collisions resulted in the ejection of fragments hundreds of kilometers across and sharing similar orbits. The resulting groups are known as asteroid families.

Is Any­thing Go­ing to Hit Earth? A Neat Ap­proach to Make Quicker and More Ex­act Ana­lyses of Fire­ball Ob­ser­va­tions

Maria Gritsevich hopes that more meteorites will be consciously discovered in the future than now because they are free samples from the space. We should go and to empty the letterbox.

When should we send expeditions to look for meteorites that have impacted Earth? There is not enough time for more close study of all fireballs observed in the sky. The observation of a bright phenomenon reveals that a meteoroid has entered the atmosphere from space, but does any part of it end up on Earth? Only those with the survived terminal mass will reach the earth, but unfortunately many of them remain undiscovered.

Saturday, December 21, 2019

New NASA Image Provides More Details about First Observed Interstellar Comet

The interstellar comet Comet 2I/Borisov (blueish image at right), near a spiral galaxy (left), in an image taken on Nov. 16, 2019, by the Hubble Space Telescope. Credit: NASA, ESA and David Jewitt/UCLA

A new image from NASA’s Hubble Space Telescope provides important new details about the first interstellar comet astronomers have seen in our solar system. The comet, called Comet 2I/Borisov (the “I” stands for interstellar), was spotted near a spiral galaxy known as 2MASX J10500165-0152029. It was approximately 203 million miles from Earth when the image was taken on Nov. 16.

Friday, December 20, 2019

NRL-camera Aboard NASA Spacecraft Confirms Asteroid Phenomenon

An image from the Wide-Field Imager for Solar Probe (WISPR), a U.S. Naval Research Laboratory-built camera, displays the dust trail of asteroid 3200 Phaethon near the Sun on Nov. 5, 2018. The trail is visible for the first time in the region where the white dots are omitted. 3200 Phaethon’s orbit intersects Earth’s orbit every year, and results in the Geminid Meteor shower. (U.S. Navy photo by Brendan Gallagher and Guillermo Stenborg)

A U.S. Naval Research Laboratory-built camera mounted on the NASA Parker Solar Probe revealed an asteroid dust trail that has eluded astronomers for decades.