“HD 21749b orbits a dwarf star about 53 light years away in the constellation of Reticulum”.
NASA’s latest planet angling probe has exposed a new world outside our solar system, revolving a dwarf star 53 light years away. This is the third new planet confirmed by the Transiting Exoplanet Survey Satellite Since its launch in April last year. The planet named HD 21749b,orbits a bright near by dwarf star about 53 light years away, in the constellation Reticulum, and appears to have the longer orbital period of the three planets so far identified by TESS. HD 21749b journeys around its star in a relatively leisurely 36 days, compared to the two other planets pi Mensae b, a “Super Earth” with a 6.3 day orbit and LHS 3844b, a rocky world that speeds over its star in just 11 hours.
All three planets were discovered in the first three months of TESS observation. Diana Dragomir , a researcher in the Massachusetts Institute o f Technology (MIT) says it’s the coolest small planet that we know of around a star this bright. We know a lot about atmospheres of hot planets but being it’s very hard to find modest planets that orbit farther from their stars, and are therefore cooler, we haven’t been able to learn much about these smaller cooler planets. Ms.Dragomir says here we were lucky and caught this one and can now study it in more detail. The planet is about three times the size of the earth, which puts it in the category of a “Sub Neptune”.
However, it is absurd that the planet is rocky and therefore livable, it’s more likely made of gas, of a kind that is much more heavy than the atmospheres of either Neptune or Uranus. we think this planet wouldn’t be as gaseous as Neptune or Uranus, which are mostly hydrogen and really puffy. Ms. Dragomir says that the planet likely has density of water, (or) a thick atmosphere.