How Earth’s life comes back from the effects of sterile asteroids

Be careful with supervillains. Even the most important and worst asteroids are not 100% efficient as terminal gadgets.

A very effective cosmic impression enough to wipe out all life on the Earth’s floor will orbit large amounts of rocks around the Sun. Steinn Sigurðsson, a professor of astronomy and astrophysics at Pennsylvania State University, will notice that most of these small pieces and items fall back on a damaged and ragged planet, and probably bring life again.

“It’s very safe,” Sigurdsson said in the last month of the breakthrough talk on the convention at the University of California, Berkeley.

The existence of such a “ house shelter ”, supported by a recent PC simulation Sigurðsson and his colleagues, tracks the trajectory of rocks blown off the earth and other rocky planets into the orbit of the sun. did.

It is a relatively small subclass of discharged material. Many of the released rocks have not reached their escape rate and will soon descend again. Indeed, scientists believe that the most significant killer in the terrible impression of the past 66 million years is the fiery international rock that heats up when returning the higher environment of the earth to about 2,700 degrees Fahrenheit (1,482 degrees Celsius). I think it was a typical storm.

Sigurðsson and his employees have adopted a simulated orbital evolution of the ejector for 10 million years. They have chosen this period. “Because there is a meme in the literature and there is a meme that can sustain biological space (within the rocks of the universe) for about 10 million years,” Sigurðsson said. “In the past, you are pushing your luck.”

The ejecta begins in a solar orbit like a home planet and many substances are eventually reabsorbed. But gravity tags from passing planets have pulled some of the rock fragments into completely different paths.

For example, in the simulation, a few percents of orbiting ejecta have made their way to one of many different rock planets. We all know that this actually happens. Scientists have recognized over 100 Mars meteorites on Earth. However, the extent of rock exchange within the internal photovoltaic system was sudden, Sigluzson said.

“It was really surprising,” he said. “The rock is actually raining.”

Less than 0.1% of the emissions reach external photovoltaic systems. This is the area of ​​the suspicious creatures Jupiter’s moon Europa and Saturn’s moons Enceladus and Titan, each of which can even support life.

That doesn’t sound like much, but thousands of rocks are definitely counted in the 4.5 billion-year history of photovoltaic systems, based on workforce simulations. And these results characterize conservative estimates, confused Sigluzson.

And if everything is based on a plan, quickly find life in the market. NASA will launch its mission to Europe in the early to mid-2020s. The Europa Clipper probe characterizes the ocean below the moon’s surface during the course of dozens of fly-bys, as well as looking for places to land for life-threatening landers. (The landing mission is not officially listed in a NASA book, but Congress has ordered a house company to develop it.)

NASA may be considering growing a Titan drone mission called Dragonfly. Dragonflies may find potential indicators of life in Titan’s air, among the types of gases that are in a chemical imbalance. (Dragonfly, one of the two finalists, is a mid-class mid-2020s mission launch spot with a comet sample return mission called CESAR.

Similarly, Sigurðsson states that a few percents of the released rocks have completely escaped from our photovoltaic systems, increasing the likelihood that life from Earth (or Mars) could have seeded the world around different stars Was. Such seeds can also occur in different routes. Some scientists believe that life may have returned to Earth on interstellar objects.
In fact, it is all a hypothesis. No one really knows where the earth’s life began or how far it spreads. But different analyzes mean that it is always possible to make a world-to-world impact support journey.

For example, some microorganisms, and very tough small animals called tardigrades, have been experimentally proven to be able to withstand the harsh conditions of the home. And the very effective effects of shipping such a beast on interplanetary or interstellar trekking are not as lethal as you might expect.

Benjamin Weiss, a professor of planetary science at the Massachusetts Institute of Technology, analyzed this impact in a breakthrough talk about the convention. Studies by Weiss and his colleagues indicate that most temperatures will be surprisingly low after Mars’ meteorite has been launched from their planet.

And Weiss and Sigurdsson each say that life can effectively survive a journey from home.

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