Dozens of planets have life like Earth

Astronomer Jim Kasting, Chairman of the Analytical Group of the Planetary Space Discovery Program of the US Aerospace Agency (NASA), said around the world, there are dozens of other planets with living that humans cannot observe.

In the new book entitled "How do you find a planet with life?", Kasting says it is likely that stars observed in the sky are revolving around a planet that exists.

He is optimistic that Earth-like planets are very popular in the vast universe. If any stars like the star in the solar system are detected, there are many opportunities to detect life-like planets like Earth.

Artwork: Thomas Houck

NASA scientists believe that the closest star to the solar system is Alpha Centauri, more than 4 light-years away from Earth (about 40 trillion km).

However, the scientific community has not been able to confirm whether any planet like Earth revolves around Alpha Centauri because it cannot be seen clearly.

Scientists began to study the fundamental problems of a living planet.

First, the planet's composition must have stones, like Earth, unlike Jupiter with only gas. Second, it must have an appropriate distance from its Sun. Thus, any life of an embryo on this planet will not be burned or not frozen.

Scientists still do not know whether life on the planet requires similar water on Earth. If carbon dioxide, oxygen, ozone and gases like methane or nitrous oxide appear by excreta on the planet, the chances of having life on that planet are very high.

Current methods of detecting planets rely primarily on stars orbiting the planet's orbit. The most common is the Doppler spectroscopy method, observing small changes in the orbit and the speed of each star due to the planet's gravity.

With this method, scientists have discovered about 400 planets outside the solar system and most of these planets are very large.

In the future, scientists will use extremely powerful space telescopes to further clarify the basic issues related to life in the aforementioned planets.