Quite a lot has been going on:
Unexpected Orbits of Ancient Stars Prompt Rethink on Milky Way Evolution
Representation of the orbit of the star 232121.57-160505.4 in the Galactocentric cartesian frame, colour coded according to the time. The white dot represents the current position of the star. The black circled dot and the dashed circular line indicate the position and the approximated orbit of the Sun, respectively. Credit:: Cordoni et al.
Australian telescopes and European satellite combine to reveal unexpected motions among the Galaxy’s rarest objects.
Earth has two 'mini Moons' and the second has been orbiting us for nearly 3 years
Researchers at the University of Hawaiʻi Institute for Astronomy (IfA) announced a “detailed research” into the prospect of discovery of other mini-moons in the Earth’s solar system months after the former mini-moon, known as 2020 CD3, observed by Arizona's Steward Observatory turned out to be space junk.
The presumed mini-moon dubbed as 2020 CD3 was first discovered using the 1.5m Mt. Lemmon telescope, operated by the Catalina Sky Survey at the University of Arizona’s Lunar and Planetary Laboratory in Tucson. Initially, it was believed to be a temporary satellite and was named asteroid 2020 SO.
Minimoon Has Drifted Away After Three Years Of Orbiting Earth - UNILAD
Astronomers at the Catalina Sky Survey in Arizona spotted the minimoon, which is about the size of a car, back in February. At first, they weren't sure whether it was just a piece of space junk, but after further research the Minor Planet Center confirmed that the small asteroid had been orbiting Earth for about three years.
The minimoon – officially called 2020 CD3 – has a diameter of about 1.2 metres, and scientists believe that, based on its colour and brightness, it is probably made of a silicate rock similar to objects found in the asteroid belt. It also had a far larger orbit than our actual moon, circling our planet about once every 47 days.
And here's another article:
Scientific instruments - With the loss of Arecibo, an era ends for radio astronomy | Science
ARECIBO OBSERVATORY was conceived in an era of space-age monumentalism, an imposition of geometry onto geology as striking in its simplicity and scale as the greatest brutalist architecture. When the James Bond franchise, in its pomp a showcase for iconic 1960s design, eventually got around to using the 306-metre dish as a location in the 1990s, the only surprise was that it had taken so long.
The observatory was not new to spycraft. It was created as a tool for using radar to study the ionosphere, an electrically charged upper layer of the atmosphere. America's defence department had an interest in such work, which might lead to new ways of characterising incoming missiles or of snooping on enemy transmissions, so it stumped up some cash.
The arches of chaos in the Solar System | Science Advances
Besides the piecemeal treatment of JFCs, however, the influence of such manifolds on natural bodies has been largely underappreciated in astrophysical and celestial dynamics ( 11 ). The attention of most dynamical astronomers in the past few decades has been focused upon another important and far-reaching mode of transport, namely, chaotic diffusion from orbital resonances ( 12 ).
Here, we use the FLI to detect the presence and global structure of space manifolds, and capture instabilities that act on orbital time scales; that is, we use this sensitive and well-established numerical tool to more generally define regions of fast transport within the Solar System ( 28 ).
Milky Way family tree: Astrophysicists reconstruct the galaxy merger history of our home galaxy
The German-British team used these simulations to relate the ages, chemical compositions, and orbital motions of the globular clusters to the properties of the progenitor galaxies in which they formed, more than ten billion years ago. By applying these insights to groups of globular clusters in the Milky Way, they not only determined how massive these progenitor galaxies were, but also when they merged with our home galaxy.
"The main challenge was that the merger process is extremely messy, because the orbits of the globular clusters are completely reshuffled," explains Dr Kruijssen. "To overcome this complexity, we developed an artificial neural network and trained it on the E-MOSAICS simulations. We were astonished at how precisely the artificial intelligence allowed us to reconstruct the merger histories of the simulated galaxies, using only their globular clusters.
Kraken Reveals Itself: Astrophysicists Reconstruct the Galaxy Merger History of Our Home Galaxy
Family tree of the Milky Way. The main progenitor of the Milky Way is denoted by the trunk of the tree, colored by stellar mass. Black lines indicate the five identified galaxies. Grey dotted lines depict other mergers that the Milky Way experienced that could not be connected to a specific progenitor.
The German-British team used these simulations to relate the ages, chemical compositions, and orbital motions of the globular clusters to the properties of the progenitor galaxies in which they formed, more than ten billion years ago. By applying these insights to groups of globular clusters in the Milky Way, they not only determined how massive these progenitor galaxies were, but also when they merged with our home galaxy.
Happening on Twitter
With @nasa_eyes on the Earth, you can tag along with the recently launched Sentinel-6 Michael Freilich satellite in… https://t.co/yvEDrQfrcp NASAEarth (from Washington, DC) Wed Nov 25 21:35:19 +0000 2020
🚀 @SpaceX's Falcon 9 rocket and the U.S.-European Sentinel-6 Michael Freilich satellite rolled out for launch! This… https://t.co/Z1rZBmtURM NASA Sat Nov 21 02:55:43 +0000 2020
🛰 🌊 We're getting closer to the Nov. 21 launch of the U.S.-European Sentinel-6 Michael Freilich satellite, that wil… https://t.co/0hbJXUdldW NASA Thu Nov 19 00:15:07 +0000 2020
Let's launch this sea scout! 🌊🔍 Today at 9:17 a.m. PT, we are launching the U.S.-European Sentinel-6 Michael Freil… https://t.co/1SryHeE9Dh NASA_LSP (from Kennedy Space Center, FL) Sat Nov 21 12:18:08 +0000 2020
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