It is located in the Milky Way galaxy, about 335 light years from Earth.
This gave them a literally astronomical number of nomadic planets in the Milky Way.
He saw that the Milky Way, that cloudy streak across the sky, is made of stars.
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That would imply that tens of billions of such worlds exist in the Milky Way alone.
The globular star clusters that surround the Milky Way also seem to come in two age groups.
At least a dozen such dwarf galaxies are thought to have once surrounded our own Milky Way.
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In the most undisturbed areas, some 15, 000 stars are on display as is the sprawling Milky Way.
It also can help predict how Earth's neighborhood, the Milky Way galaxy, formed and how it might evolve.
Further computer simulations of our Milky Way's central regions are planned to see if it can be explained.
The criteria for a dark sky site includes that the Milky Way is visible to the naked eye.
This effectively means that there should be hundreds of intermediate-sized black holes wandering invisibly through the Milky Way.
At a relatively close distance of 2.5 million light-years, Andromeda is very similar in size to our own Milky Way Galaxy.
But the new study suggests that we may be relative latecomers as far as Milky Way biology goes.
More than 60% of the stars in the Milky Way have a companion star around which they orbit.
Every star in the Milky Way glimmers with perfect clarity in the cloudless sky: diamonds flung across black velvet.
Understanding the formation and evolution of the Milky Way's bulge is vital for understanding the galaxy as a whole.
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They were then despatched towards deep space, in the general direction of the centre of our Milky Way Galaxy.
Try as they might astronomers simply cannot see through these clouds to the centre of our Milky Way galaxy.
So now German researchers have offered up another explanation: a massive explosion that took place within the Milky Way.
It is located about 335 light years from Earth, within the Milky Way.
And there are probably many alien Earths out there to be found in our Milky Way galaxy, researchers say.
Tip to tip, the galaxy spans over 522, 000 light years, making it five times bigger than the Milky Way.
That means our Milky Way galaxy hosts at least 17 billion Earth-sized planets.
The Alpha Magnetic Spectrometer can observe electron and positrons that emerge from possible dark matter "annihilations" in the Milky Way.
The researchers saw the loop when looking at the Arches Cluster, a star-forming region close to the Milky Way's centre.
"I knew there had been a geomagnetic storm but we were only planning to photograph the Milky Way, " Mr Thornley said.
Centaurus A is immense, perhaps 50 times larger than the Milky Way, home to the Earth and about 100 billion stars.
While the new photo captures an unprecedented number of stars, it's far from a complete stellar picture of the Milky Way.
If small galaxies contained enough dark matter, it could keep them intact even after several passes through the Milky Way mangle.
When she was a child a century ago, the known universe extended only to the edge of the Milky Way galaxy.
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