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31-10-2020

Earth is part of a solar system where several planets revolve around a star. It is the pull of the Sun that is keeping the worlds in their set orbits in a uniform manner. While such solar systems are in abundance in the Milky Way galaxy, there exist millions of rogue planets in the galaxy who do not have a central star to revolve around and instead they just go about their own way in deep space.

Scientists have found about 4,000 exoplanets and a few rogue planets but a recent finding has left them surprised. Researchers have found a world, which is similar in size to Earth, travelling alone without any family. This could be the smallest rogue world ever detected.

Of the many rogue planets found till now, most are massive in size, often ranging from two to 40 times the mass of Jupiter (it is important to remember here that Jupiter is equivalent to about 300 Earths). So with the discovery of the recent free world, scientists are looking at the possibility of the wide existence of small rogue planets.

Lead study author Przemek Mroz, a postdoctoral scholar at the California Institute of Technology, told Live Science in an email that the odds of �detecting such a low-mass object are extremely low�. So this means that either they �were very lucky, or such objects are very common in the Milky Way�. he goes on to say that they might be �as common as stars.�

Experts use light coming from a star to detect the various exoplanets. So it is very difficult to spot a world without a star. Moreover, for a planet which is in between Earth and Mars in terms of mass, detecting it is way harder. To hunt the world, scientists used "gravitational microlensing," which involves watching foreground objects pass in front of distant background stars. As part of the project, the team was using a 1.3-meter telescope at Las Campanas Observatory in Chile tomonitor millions of stars near the Milky Way's centre on every clear night.