According to a recent study, our planet may well be the donor of life in the galaxy. Life can spread in many different ways, and the Earth, as we know, she is not deprived. Scientists believe that our planet is a major supplier of life in the galaxy milky Way. Is it possible? New evidence, which will be discussed in this article indirectly supports this theory.
The hypothesis of panspermia
On our planet for all its history fell a huge number of comets. It is not excluded that millions of years ago, one or several comets carried a large number of organic compounds. Because of the fall to the bottom of the ocean, these chemical compounds interacted with water, which, as we know, the key to the origin of life.
Scientists have long known hypothesis called panspermia. According to this hypothesis, are at close distance from each other of the heavenly bodies can exchange materials and organisms. This happens due to a fall on Earth asteroids and comets. Strikes in the fall can be so strong that the cosmos fall debris from terrestrial microorganisms on them. Panspermia is based on the assumption of scientists that some microorganisms are able to survive during space travel.
How are stars and comets
The sun does not stand still. Over the last 4.6 billion years heavenly body came close to many other stars nearby. Presumably on the outskirts of stars is the so-called Oort Cloud — a repository of comets. Thus, the convergence of the Sun and other stars are able to change the trajectory of comets and send them towards the passing star systems.
Note that the existence of the Oort Cloud is not confirmed by the instrumental. However, many indirect evidence points to its existence. Not long ago, one of the participants in our Telegram chat very convincingly argued on the subject.
Comet in the Earth’s oceans and on different continents has allowed life to move around the planet. And, according to the theory of panspermia, travel on comets or their debris (formed by the tension between) through space to other worlds. This is the opinion of the author of the study Robert Zubrin, President of Pioneer Astronautics in Colorado, USA.
The earth can be a major supplier of life in the galaxy, that’s already 3.5 billion years ago. Zubrin came to this conclusion based on calculations that take into account many factors, such as the average stellar density near the Sun and the composition of stars in our galaxy.
The exact number of comets in the Oort cloud is not known. However, in the study suggested about one trillion. Zubrin has used all available information to estimate how often there are collisions of stars and to understand their consequences.
The comet is the cause of life and mass extinction
The calculations showed that not far from our home stars occurs about 47 stellar collisions in one billion years. And the Earth, as we know, was born 4.6 billion years ago. Thus, collisions occur every 21 million years.
Which can not fail to note, coincides with the periods of mass extinction of life on Earth. Today, scientists believe that the rain of comets caused the extinction of dinosaurs 66 million years ago, and is also responsible for previous mass extinctions.
The sun is more massive than 90% of the stars in the milky Way. This means that the Oort Cloud around him more than around other stars. And so our Sun may be the main supplier of life in stellar collisions, sending in other solar systems is three times more comets.