Posted on 02/04/2018 11:03:53 PM PST by Simon Green
In an incredible world first, astrophysicists have detected multiple planets in another galaxy, ranging from masses as small as the Moon to ones as great as Jupiter.
Given how difficult it is to find exoplanets even within our Milky Way galaxy, this is no mean feat. Researchers at the University of Oklahoma achieved this thanks to clever use of gravitational microlensing.
The technique, first predicted by Einstein's theory of general relativity, has been used to find exoplanets within Milky Way, and it's the only known way of finding the smallest and most distant planets, thousands of light-years from Earth.
As a planet orbits a star, the gravitational field of the system can bend the light of a distant star behind it.
We know what this looks like when it's just two stars, so when a planet enters the mix, it creates a further disturbance in the light that reaches us - a recognisable signature for the planet.
So far, 53 exoplanets within the Milky Way have been detected using this method. To find planets farther afield, though, something a little bit more powerful than a single star was required.
Oklahoma University astronomers Xinyu Dai and Eduardo Guerras studied a quasar 6 billion light-years away called RX J1131-1231, one of the best gravitationally lensed quasars in the sky.
The gravitational field of a galaxy 3.8 billion light-years away between us and the quasar bends light in such a way that it creates four images of the quasar, which is an active supermassive black hole that's extremely bright in X-ray, thanks to the intense heat of its accretion disc.
Using data from NASA's Chandra X-ray observatory, the researchers found that there were peculiar line energy shifts in the quasar's light that could only be explained by planets in the galaxy lensing the quasar.
It turned out to be around 2,000 unbound planets with masses ranging between the Moon and Jupiter, between the galaxy's stars.
"We are very excited about this discovery. This is the first time anyone has discovered planets outside our galaxy," Dai said.
Of course, we haven't seen the planets directly, and are unlikely to in the lifetime of anyone alive today. But being able to detect them at all is an incredible testament to the power of microlensing, not to mention being evidence that there are planets in other galaxies.
Of course, common sense would dictate that planets are out there - but evidence is always nice.
"This is an example of how powerful the techniques of analysis of extragalactic microlensing can be,"said Guerras.
"This galaxy is located 3.8 billion light years away, and there is not the slightest chance of observing these planets directly, not even with the best telescope one can imagine in a science fiction scenario.
"However, we are able to study them, unveil their presence and even have an idea of their masses. This is very cool science."
The research has been published in The Astrophysical Journal.
So how can they tell a small moon from a Death Star searching for planets full of beings to enslave?
Wow. Just, wow!
We are alone.
Mighty boring of you.
If we can determine they are there, they can determine WE are here. Hmmmm.
Tell them Goober says hey!
They will get the memo in 3.8 billion years.
However such science should not brespond wasted and I propose to use it to find Obama birth certificate and other records he has hidden.
In other words these 2,000 planet sized bodies are NOT orbiting stars. The are traveling freely in their galaxy. Are there similar planets and in the same quantity in out galaxy? Planet X anyone?
For more see: Astronomy: Bound and unbound planets abound
For the Bazzilionth time Scientists have discovered more uninhabitable unbound unplanets zooming around in the far reaches of, you guessed it, SPACE.
Am I correct in guessing that the planets in question have to be orbiting in the plane of the ecliptic of their suns/stars in relation to Earth? That’s the only way they would cross in front of the star as we view it. Which means that there are probably lots of them we can’t spot because the angle is wrong.
This topic was posted , thanks for posting it, thanks for reading it. I'm enjoying my end of the year check for missed topics.
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The scientists are busy taking apart radios to find the little talking people inside.
;-)
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