The never-before-seen astronomical objects were found by scientists in Australia.
The 200 stars appear to have come from a merger between the Milky Way and a dwarf galaxy long ago.
One suggestion is the star collapsed into a black hole without producing a supernova—a phenomenon that has never been identified in such a large star before.
Determining the abundance of Earth-like planets is one of the major goals of planetary science.
Researchers say determining intelligence across the galaxy could give clues to our own fate.
R5519 is thought to have formed through a collision with a "victim" galaxy about three billion years after the Big Bang.
"It seems that an important part of the Milky Way's stellar mass was formed due to the interactions with Sagittarius and wouldn't exist otherwise," scientist Carme Gallart said.
A newly discovered fast radio burst from within our galaxy confirms an exotic form of neutron star as one possible source of the highly energetic transmissions.
The black hole forms part of a triple star system known as HR 6819, which can be seen without binoculars or telescopes from the southern hemisphere on a dark, clear night.
The fast radio burst appears to have come from a galactic magnetar and has been described as a "breakthrough" for the research field.
Researchers identified the minor planets beyond the orbit of Neptune.
Temperatures on the day side of the planet—which perpetually faces its star—are hot enough to vaporize iron.
Researchers have long debated the cause of this warping, and several hypotheses have been proposed to explain it.
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"I was pretty excited. Coming into the internship, it would be hard to say that I expected to find a planet," Wolf Cukier said.
One planet, known as Proxima b, has already been detected around the star.
Betelgeuse a nearby red supergiant star which is up to 20 times more massive than our sun.
Researchers have observed the faint glow of "gas halos" around galaxies hosting supermassive black holes.
"Imagine condensing two-thirds of the Milky Way—which has a stellar mass equivalent to 60 billion suns—into a black hole and you have what we measured," said researcher Roberto Saglia.
The galaxy, spotted with ALMA, had been obscured by a huge cloud of dust, making it invisible to other telescopes.
Researchers estimate that the explosion lasted for approximately 300,000 years.
"We have never seen anything like this in the 24 years we have studied the supermassive black hole," researcher Andrea Ghez said.
Astronomers found a "runaway star," dubbed PG 1610+062, in the outer halo of the Milky Way.
Scientists found the enormous black hole after spotting an "unusual" object at the core of a bright galaxy cluster about 700 million light years from Earth.
The European Southern Observatory image shows the N180 B nebula, a well-known source of new stars.
The image of the galaxy includes up to 15 million stars.
The discovery could help unlock the secrets of the formation of the universe.
Researchers used the European Space Agency's star-mapping satellite to make a stunning discovery about the Milky Way.