Super-Earth Rocky Planet TOI-270 B: What Makes It Unique Compared to Others in Our Solar System?

NASA Telescope Reveals Seven Earth-sized Planets Around Single Star — UNSPECIFIED: In this NASA digital illustration handout released on February 22, 2017, an artist's concept allows us to imagine what it would be like to stand on the surface of the exoplanet TRAPPIST-1f, located in the TRAPPIST-1 system in the constellation Aquarius. Photo digital Illustration by NASA/NASA via Getty Images

The Transiting Exoplanet Survey Spacecraft, or TESS, a NASA world-hunting satellite, has discovered three of the tiniest, closest planets outside of Earth's solar system.

According to "A Super-Earth and Two Sub-Neptunes Transiting the Nearby and Quiet M Dwarf TOI-270," one planet is solid and somewhat larger than Earth. At the same time, the other two are gaseous and approximately double Earth's size.

The rocky planet is 73 light-years away and is in the "habitable zone," which implies it is far enough away from a neighboring star to be able to support life. It also doesn't produce a lot of flares, which makes it easier for scientists to study.

TOPSHOT-FRANCE-SPACE — TOPSHOT - A Soyouz rocket lift-off from Europe's launchpad in Kourou, French Guiana, on December 18, 2019, with Europe's CHEOPS planet-hunting satellite on board. - The 30-centimetre (12-inch) telescope has been designed to measure the density, composition, and size of numerous planets beyond our solar system, so-called exoplanets. According to the European Space Agency (ESA), CHEOPS will observe bright stars that are already known to be orbited by planets. JODY AMIET/AFP via Getty Images

"Missing Link" Planet: TOI-270b Not Like Any Other Solar System

Astronomer Stephen Kane of UC Riverside's NASA-funded Alternative Earths Astrobiology Center said in a statement that they discovered just a few planets like this in the habitable zone and even fewer in the vicinity of a calm star. Hence, they found the discovery unusual.

The smaller planet is not only in the habitable zone-the range of distances from a star where a world might have liquid-water oceans-but the TOI-270 star is also close, making it brighter for viewing. It's also "silent," meaning it produces few flares, which Kane says makes it easier for astronomers to examine it and its circling planets.

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Kane told The Daily Galaxy that the known planets in the TOI-270 system range from 1.2 to 2.4 times the size of Earth. So the planets straddle an attractive threshold between smaller rocky planets and bigger gas giant planets. Measuring the makeup of these planets' atmospheres, according to Kane, is a critical step toward understanding how the worlds developed and evolved and why they don't have similar planets in the system.

Will JWST Help TESS in Studying This System?

Despite this, scientists believe it is improbable that the rocky planet harbors life since it is expected to have a thick atmosphere that traps heat and makes the surface too hot for life to exist. Researchers hope to investigate the system using James Webb Space Telescope.

TESS monitors portions of the sky for 27 days using four big cameras. Its attention is drawn to stars less than 200 light-years from Earth's solar system.

The spacecraft just finished its first year on the job, during which it identified more than 20 planets outside of our solar system.

While TOI-270 is far enough away that no one alive today would ever visit there, it is still considered close at 73 light-years. Kane said our galaxy has a diameter of 100,000 light-years and is one of the millions of galaxies.