This means that microbes may be able to take advantage of this process,

faster than the relative velocities of two stars at close encounters,

The solar system will be bombarded by such comets,

Every 26 million years or so, it collides with the Oort cloud region at the edge of the solar system,

Flying outward at a speed of 108,000 kilometers per hour,

This number is very close to the cycle of mass extinctions on Earth,

The existence of life on earth and the evolution of advanced life is also related to the fact that the earth h

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Comets from alien galaxies are the main cause of extinction on Earth,

If its mass is too large, it will burn too fast to wait for life to appear,

Frequent exchange of material with other planetary systems,

Dust kicked up by comet impacts can be pushed by the pressure of sunlight,

The sun has a companion star called Nemesis,

Earth's orbit is appropriate, it makes the temperature on Earth just right for life to exist,

is suitable for the existence of life,

Jumping from the solar system to another planetary system passing by,

Mass extinctions on Earth seem to happen every 20 to 40 million years,

If Earth were in the orbit of Venus or Mars, it would be too hot or too cold for life to exist,