Aleksander Wolszczan and Dale Frail discovered the first exoplanets, planets outside the solar system, in 1992. Using the Arecibo radio telescope in Puerto Rico, they located two rocky planets orbiting a star in the Virgo constellation. Since this initial discovery, astronomers have found thousands of exoplanets.
Humanity's growing tally of exoplanets — worlds seen orbiting other stars — stands at 4,151. Most were found indirectly, as they passed in front of their stars and cast a telltale shadow, or as they caused their star to wobble as they swung around it. Only 50 have been directly imaged through a telescope.
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A Star Orbiting A Black Hole Follows The Same Gravitational Dance As Mercury Orbiting The Sun
In the center of our galaxy hundreds of stars are known to orbit a massive object. For decades we have observed them. By tracking their motion we have shown that the mass is a supermassive black hole. Known as Sagittarius A*, it has a mass of about 4 million Suns in a volume that would fit inside the orbit of Mercury.
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{{< figure name="s2.png" credit="Wikipedia user Cmglee" alt="The orbits of stars close to Sagittarius A\*." caption="The orbits of stars close to Sagittarius A\*." class="right">}}
Astronomers Find a Six-Planet System Which Orbit in Lockstep With Each Other - Universe Today
To date, astronomers have confirmed the existence of 4,152 extrasolar planets in 3,077 star systems. While the majority of these discoveries involved a single planet, several hundred star systems were found to be multi-planetary. Systems that contain six planets or more, however, appear to be rarer, with only a dozen or so cases discovered so far.
This is what astronomers found after observing HD 158259, a Sun-like star located about 88 light-years from Earth, for the past seven years using the SOPHIE spectrograph . Combined with new data from the Transiting Exoplanet Space Satellite (TESS), an international team reported the discovery of a six planet system where all were in near-perfect rhythm with each other.
The Air Force wants you to hack its satellite in orbit. Yes, really – TechCrunch
When the Air Force asked hackers to break into a F-15 fighter jet at last year’s DEF CON security conference, the results were both eye-opening and eye-watering.
It was the first time hackers were allowed to work on the system to look for bugs. In just two days, a team of seven hackers found a ton of vulnerabilities , which if exploited in the real world could have crippled a critical aircraft data system, causing untold and potentially catastrophic damage.
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Research: Orbiting satellites detect floating plastic litter 'islands'
Researchers have proven that satellites can be used to detect plastic floating on the surface of the sea, in a discovery that represents a major boost to efforts to clean up the giant patches of plastic that are found throughout the world's ocean.
Scientists at Plymouth Marine Laboratory have developed a technique where machine-learning algorithms can parse satellite imagery and pick out patches of plastic, distinguishing the litter from natural debris such as driftwood, seafoam, and seaweed.
'Zombie' Satellite Found By Amateur Radio Operator On COVID-19 Lockdown : NPR
The long-lost satellite was built in MIT's Lincoln Laboratory. Pat Greenhouse/Boston Globe via Getty Images hide caption
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"Most zombie satellites are satellites that are no longer under human control, or have failed to some degree," says Scott Tilley.
In 2018, he found a signal from a NASA probe called IMAGE that the space agency had lost track of in 2005. With Tilley's help, NASA was able to reestablish contact.
Astronomers Just Identified 19 More Asteroids They Think Are Interstellar
The Solar System has been here for a long time. So, when 'Oumuamua was spotted in 2017, it was almost a dead cert it wasn't the only object from interstellar space to visit us over that 4.57 billion-year history. Then comet 2I/Borisov showed up last year. That basically clinched it.
But where are the rest of our interstellar visitors? We'll probably find a few more flying in from the wilds in the coming years. And, according to new research, a whole bunch of interstellar asteroids have been hanging out right here in the Solar System for a very long time.
SpaceX sends 60 more Starlink rockets to orbit, nails the landing - CNET
A few minutes after the launch, with the second-stage booster and batch of satellites headed toward a deployment point in low-Earth orbit, the first-stage booster returned to Earth for a successful landing right on the bull's-eye on the droneship Of Course I Still Love You in the Atlantic Ocean.
A pair of ships equipped with giant nets will later attempt to catch the two halves of the nose cone, or fairing.
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