Our galaxy contains 100 billion planets
Washington: Our galaxy contains a minimum of one hundred billion planets – about one for each star – and plenty of of them might harbour life, a brand new study claims.
Contrary to previous belief, the newest analysis by astronomers suggests star systems with planets are literally the norm across the cosmos.
Astronomers at the California Institute of Technology created their estimate whereas analysing planets orbiting a star referred to as Kepler-32 – planets that area unit representative of the overwhelming majority of planets in our galaxy, NASA said.
“There area unit a minimum of one hundred billion planets within the galaxy, simply our galaxy,” same John Johnson, prof of planetary uranology at Caltech and author of the study. “That’s impressive,” same Johnson in a very statement.
“It’s a staggering variety, if you think that concerning it. Basically, there is one amongst these planets per star,” adscititious Swift, lead author of the study.
One of the elemental queries concerning the origin of planets is what number of them there area unit. just like the Caltech cluster, different groups of astronomers have calculable that there’s roughly one planet per star, however this can be the primary time researchers have created such AN estimate by finding out M-dwarf systems, the foremost varied population of planets famed.
The planetary system in question, that was detected by NASA’s astronomer house telescope, contains 5 planets. 2 of the planets orbiting Kepler-32 had antecedently been discovered by different astronomers.
The Caltech team confirmed the remaining 3, then analysed the five-planet system and compared it to different systems found by astronomer.
M-dwarf systems like Kepler-32′s area unit quite totally different from our own system. For one, M dwarfs area unit cooler and far smaller than the Sun. Kepler-32, for instance, has [*fr1] the mass of the sun and [*fr1] its radius.The radii of its 5 planets vary from zero.8 to 2.7 times that of Earth, and people planets orbit extraordinarily near their star.
The whole Kepler-32 system fits within over a tenth of AN astronomy unit (the average distance between Earth and also the Sun) – a distance that’s a couple of third of the radius of Mercury’s orbit round the Sun.
The fact that M-dwarf systems immensely amount other forms of systems carries a profound implication, in step with Johnson, that is that our system is extraordinarily rare.