Life may have spread into the Milky Way due to comet exchange

According to the latest research, life has many options to spread throughout the Milky Way galaxy over the years, and our personal Earth could also be one of many important dispersal factors.

The random movement of the sun through the house has introduced near many different stars over the past 4.6 billion years. These close encounters examine Robert Zublin, president and creator of the Colorado-based company Pioneer Astronaut, perhaps driving a comet far from each technique and encouraging them toward passing stars.

This “comet exchange” could answer much of the Earth’s previous mass extinction, Zublin discovered. However, he said, this phenomenon encourages life in larger images and helps to hop from island to island across the vast ocean of homes.

“This is the mechanism by which life may have been delivered to us and may have brought life to many different locations over the last 3.5 billion years,” Zublin advised If you then “extrapolate and say” everyone is doing this “, you take the galaxy as a supercritical reactor and become saturated with life. ”

This conclusion relies on some simple calculations. This takes into account the typical star density in the vicinity of the Sun (0.003 stars per cubic light-year), the Sun’s speed for this starfield (about 22,370 mph, or 36,000 km / h) and The composition of the Milky Manner stellar inhabitants (eg, about 75% smaller, dim pink dwarf).

In addition, Zublin assumed that different stars have large comet reservoirs around them, such as our personal solar Alt Cloud. The scope of the Oort Cloud is unknown. Its surroundings are estimated to be between 30,000 and 100,000 astronomical items (AU) from the sun. (One AU is the typical distance between the earth and the sun, about 93 million miles (150 million kilometers).)

Zubrin used relatively conservative measurement estimates and set the Orort Cloud radius to 40,000 AU. The decision was then used to estimate the typical radius of the Alt Cloud for different star sports. For example, the purple war star should be able to sustain the comet up to about 20,000 AU, he decided.

The number of comets in Oort Cloud is unknown. Zubrin assumed 1 trillion inhabitants. It is cast constantly, but this fact has reached a density of 4 comets per 1,000 cubics AU.

Zubrin has determined that the sun can grab the object by gravity if the other cloud’s Alt Cloud object falls within 10 AU of that object by gravity. Therefore, there are so many captures per stellar encounter. For example, suppose the sun is within 20,000 AU of one other star. The sun carves a path of approximately 20,000 AU through its alien alto cloud, capturing perhaps 25,000 objects (assuming the alien alto cloud accommodates about 4 more objects per 1,000 cubics AUs).

These captured our bodies are pulled by the sun’s very effective gravitation and bombard the internal photovoltaic system. Also, some of the Oort Cloud objects do the same in different courses.

The numbers are completely different for stars of different sizes. This is due to the fact that stars are lot-dependent and therefore have strong or weak gravitational forces. For example, Zublin discovered that a pink dwarf with 30% of the sun’s mass had to get inside 3 AU of the other one star’s Alt Cloud object.

He used all of this information (and additional information) to calculate the frequency of stellar shutdowns and make penalty arrangements. And if you forgive the puns, the results were set.

He discovered that the Sun had encountered about 47 stars per billion years during its 4.6 billion year lifespan. About half of these flybys are related to pink stars. This leads to about one encounter every 21 million years.

This latter decision is of close interest to the estimated periodicity of mass extinction here on Earth. This seems to happen every 20 to 40 million years. Scientists have suggested that comet collisions deal with this loss of life, and this fact could provide a mechanism by which these ice wanderers could shout at Earth at common intervals. Offers.

For example, some researchers have hypothesized that the Sun has an undiscovered companion called Nemesis that pushes down the Oort Cloud every 26 million years. Others think this instability is courtesy of the disk of dark matter in the galaxy. r Photovoltaic systems go through the same time scale.

However, Zublin’s work refers to the alien comet as the first mediator of destruction, not something inherent in our photovoltaic system.

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