The world's oldest astronomical (motion picture) film is believed to be this one, from 1900 ...
Magician's Film of 1900 Solar Eclipse Is World's Oldest Astronomical Movie (And It's Pure Magic)
Magicians are known for making things disappear, but when the sun vanished from the sky on May 28, 1900, it happened not through a sleight of hand, but because of a solar eclipse.
There was magic in the air that day after all — movie magic. Nevil Maskelyne, a performing magician who also happened to be a pioneering filmmaker, preserved the spectacular event — as the moon passed between Earth and the sun — on celluloid, from a location in North Carolina.
More than a century later, Maskelyne's film of the eclipse has been digitally scanned and restored in a collaboration between the Royal Astronomical Society (RAS) and the British Film Institute (BFI), and is free to view online. The film, titled "Solar Eclipse," is thought to be the world's oldest surviving astronomical film ...
The fireball was a meteor, or space rock, entering the Earth’s atmosphere that broke apart into hundreds of smaller pieces. When the pieces of this rock hit the ground, their name changed to meteorite. One meteorite fragment weighed about two pounds and smashed through the roof of a house, destroying the owner’s dining table. Another one crashed through the roof of a dog house, narrowly missing a sleeping dog. Close calls!
All highly theoretical (not wrong, just not provably in an absolute scientific manner). No one knows for sure if dark matter holds galaxies, etc together and maintain the velocities (speed) needed for their present position in the universe.
So arouse the theory of dark matter. Which provides a convenient answer for this conundrum.
Looks like someone checked down the back of the sofa;
A huge discovery that was incompatible with our current theories of dark matter and galaxy formation may have just been resolved.
After a new analysis, astronomers have determined that NGC1052-DF2 - found last year to contain absolutely no dark matter - is a lot closer to us than previous calculations estimated. Which means that it likely does have dark matter after all.
Neither of these two categories of possible exomoons has been detected to date, but at least they now have labels - moonmoons (aka sub-moons) and ploonets.
Meet the Ploonets! Runaway Moons with Delusions of Planethood Get Astronomy's Cutest Name Ever
What do you call a runaway exomoon with delusions of planethood? You call it a "ploonet," of course.
Scientists had previously proposed the endearing term "moonmoons" to describe moons that may orbit other moons in distant solar systems. Now, another team of researchers has coined the melodious nickname "ploonet" for moons of giant planets orbiting hot stars; under certain circumstances, these moons abandon those orbits, becoming satellites of the host star.
The former moon is then "unbound" and has an orbit like a planet's — ergo, a ploonet. [Top 10 Amazing Moon Facts]
Ploonets — and all exomoons, for that matter — have yet to be detected. But ploonets may produce light signatures that planet-hunting telescopes could identify, researchers reported in a new study. Their findings were published June 27 in the preprint journal arXiv and have not been peer-reviewed. ...
Seen in an image from the ALMA Observatory in Chile, the young planet orbits a small star roughly 370 light-years away, and it appears to be swaddled in a dusty, gassy disk—the exact type of structure scientists think produced Jupiter’s many moons billions of years ago.
“It’s certainly plausible that giant planets could have giant moon-forming disks around them,” says Stanford University’s Bruce Macintosh of the observation, published this week in The Astrophysical Journal Letters. “It’s an intriguing and quite possible result.”
Astronomers have seen many similar dusty clouds surrounding stars. Called circumstellar disks, these structures are the milieu in which planets form—although the exact process by which worlds emerge from the dust is unknown. In some cases, astronomers think they can see newborn planets plowing lanes into these circumstellar disks .
Isella and his colleagues studied one dust-encircled star system, called PDS 70, using data gathered in 2017 by ALMA, an array of 66 radio dishes sprinkled over a patch of the Atacama desert. The star system includes a Jupiter-size planet called PDS 70b, which has vacuumed up a gap in the dusty shroud surrounding its small, six-million-year-old home star. Another planet, called PDS 70c, traces a path near the inner edge of the gap, at roughly the same distance from its star as Neptune is from the sun.
Initially, the hazy area around PDS 70c looked like a faint arm of gas. But this year, when the team reprocessed the ALMA data using a slightly different method, the irregularities resolved into a dust ring. Isella and his colleagues interpret the newly processed image as depicting a circumplanetary debris disk.
It looks like a little dot in the photos, but this is Jupiter we're talking about, so it must have been massive even to make a mark like that. Just be glad it hit the Solar System's biggest planet and not the small blue one.
A celebration of the 16th anniversary of the Spitzer Space Telescope with some breathtaking images.
Sixteen Images for Spitzer's Sweet 16
NASA launched its Spitzer Space Telescope into orbit around the Sun on Aug. 25, 2003. Since then, the observatory has been lifting the veil on the wonders of the cosmos, from our own solar system to faraway galaxies, using infrared light.
Managed by NASA's Jet Propulsion Laboratory in Pasadena, California, Spitzer enabled scientists to confirm the presence of seven rocky, Earth-size planets in the TRAPPIST-1 system. The telescope has also provided weather maps of hot, gaseous exoplanets and revealed a hidden ring around Saturn. It has illuminated hidden collections of dust in a wide variety of locations, including cosmic nebulas (clouds of gas and dust in space), where young stars form, and swirling galaxies. Spitzer has additionally investigated some of the universe's oldest galaxies and stared at the black hole at the center of the Milky Way.
A 190 metre diameter wheel, containing 24 accommodation pods around its perimeter, will revolve to provide a semblance of gravity. Facilities are planned to be comparable to a cruise liner.
Quoted timescale target of 2025 seems highly optimistic though!