"when life gives you lemons..throw them at someone"...Grumpy Cat
Quote: Over 98% of documented species are now extinct, but extinction occurs at an uneven rate. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine invertebrates and vertebrates every million years. Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land organisms.
Since life began on Earth, several major mass extinctions have significantly exceeded the background extinction rate. The most recent, the Cretaceous Paleogene extinction event, which occurred approximately 66 million years ago (Ma), was a large-scale mass extinction of animal and plant species in a geologically short period of time. In the past 540 million years there have been five major events when over 50% of animal species died. Mass extinctions seem to be a Phanerozoic phenomenon, with extinction rates low before large complex organisms arose.
Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty. These differences stem from the threshold chosen for describing an extinction event as "major" and the data chosen to measure past diversity.
Quote: The Mystery of Planet X, which would cause periodic mass extinctions on Earth. What they learned astronomers from NASA
It stars the type brown dwarfs , ie stars cooler than our Sun, which is very close to our solar system and had not been seen before. A parallel study conducted by Davy Kirkpatrick , California Institute of Technology in Pasadena, identified 3525 stars and brown dwarfs, only 500 light-years from the Sun. The two studies were published in the Astrophysical Journal.
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