Asteroid Apophis Will Not Hit Earth for 100+ Years, NASA Says
Near-Earth asteroids are one of the more frightening natural phenomena that could cause mass casualties, due in part to their scale and the implications surrounding them—as any dinosaur will tell you.
In her video series A Field Guide to the Planets , Dr. Sabine Stanley , a Bloomberg Distinguished Professor in the Morton K. Blaustein Department of Earth and Planetary Sciences at Johns Hopkins University, said near-Earth asteroids have to meet several qualifications.
Origin of Modern Rainforests Traced to Cataclysmic Asteroid Impact That Destroyed Nearly 75% of
While the end-Cretaceous impact nearly 66 million years ago was catastrophic for terrestrial ecosystems worldwide, its long-term effects on tropical forests have remained a mystery. This is largely due to the lack of paleobotanical exploration in the region, which has only just begun to provide the data needed to evaluate these questions.
Mónica Carvalho and colleagues used fossil pollen and leaves recovered from Colombia to characterize how the impact changed South American tropical forests, finding large-scale changes in species composition and forest structure. According to the findings, late Cretaceous rainforests were characterized by an open canopy environment. However, plant diversity declined by roughly 45% at the K/Pg boundary and extinctions were widespread, particularly among seed-bearing plants.
Asteroid crater on Earth provides clues about Martian craters -- ScienceDaily
The almost 15-million-year-old Nördlinger Ries is an asteroid impact crater filled with lake sediments. Its structure is comparable to the craters currently being explored on Mars. In addition to various other deposits on the rim of the basin, the crater fill is mainly formed by stratified clay deposits. Unexpectedly, a research team led by the University of Göttingen has now discovered a volcanic ash layer in the asteroid crater.
For the first time, the researchers have now been able to detect a volcanic ash layer in the lake sediments of the 330-metre-thick crater filling in the Ries. "This is surprising, as volcanic rocks were not expected here since the circular basin was identified as an asteroid crater," says first author Professor Gernot Arp from the Geosciences Centre at the University of Göttingen. "The ash was blown in from a volcano 760 kilometres further east in Hungary.
Huge asteroid three times the size of a London bus will zip between Earth and the moon TOMORROW |
A huge asteroid three times the size of a London bus will zip between Earth and the moon tomorrow at a distance of just 159,000 miles, NASA has revealed.
Dubbed 2021 GT3, the 108ft long space rock will fly by the Earth on April 10, making its closest approach to the planet at about 22:30 BST.
The space rock, which will zip between the Earth and the Moon at 54,000 miles per hour, will be too faint to see with anything but the largest professional telescopes.
Research demonstrates that asteroid deflection can be enhanced by different neutron energies
Scientists compared the resulting asteroid deflection from two different neutron energy sources, representative of fission and fusion neutrons, allowing for side-by-side comparisons. The goal was to understand which neutron energies released from a nuclear explosion are better for deflecting an asteroid and why, potentially paving the way for optimized deflection performance.
The work is featured in Acta Astronautica and was led by Lansing Horan IV, as part of a collaboration with LLNL’s Planetary Defense and Weapon Output groups during his nuclear engineering master’s program at AFIT. Co-authors from LLNL include Megan Bruck Syal and Joseph Wasem from Weapons and Complex Integration , and the co-authors from AFIT include Darren Holland and Major James Bevins.
Tons of Invisible Asteroid and Comet Dust Falls on Us Every Year
The finding emerged from six French National Scientific Research Center expeditions in Antarctica, which spanned 20 years at the extremely isolated Concordia Research Station. Concordia made a great venue for spotting extraterrestrial dust because of the minimal amounts of Earth dust there and, despite being in Antarctica, a low rate of snow accumulation.
You don't see this dust because it's minuscule, about 1/50th the size of a grain of sand at most. But annually, the researchers reported, 5,200 tons of the stuff falls from the heavens from a variety of cosmic sources. The dust is most likely shed by asteroids or comets and is the biggest source of space material to Earth, according to the researchers.
Parasite Deep Space Drone Study Proposes Asteroid Mining - autoevolution
Happening on Twitter
Yesterday morning, OSIRIS-REx made its final flyby of the asteroid Bennu. Now, it's gathering up all the data befo… https://t.co/QpPAlb3YpL NASA_Marshall (from Huntsville, Alabama USA) Thu Apr 08 18:53:00 +0000 2021
A NASA spacecraft will bid farewell to its asteroid companion of the last few years. https://t.co/En31qteDW9 cnni (from Everywhere) Wed Apr 07 14:15:09 +0000 2021
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