The Milky Way grew by accreting many smaller galaxies. What did these doomed galaxies leave behind, and what could they say about the Milky Way’s early past?
AutoScan was able to correctly identify real sources in the validation set 96% of the time, with a false detection (claiming an artifact to be a source) rate of only 2.5%.
Over the past couple of decades the Parkes Radio Telescope in Australia has been picking up two types of mysterious signals, each lasting just a few milliseconds. One kind, the Fast Radio Bursts (FRBs), have come from seemingly random points in the sky at unpredictable times, and are thought to have a (thus far unknown) astronomical origin. The other signal, known as perytons, have been found by this paper to have an origin much close to home.
Cepheids are bright enough that we can use them to measure distances to other galaxies, but their luminosities also makes detecting their companions particularly difficult. So how do astronomers find their uncover their secret partners? Today’s paper takes a look…
How are supermassive black holes created in the first place? Oh, we need supermassive stars of course! But then, how do we form these supermassive stars…? The answer could be by ramming two protogalaxies against one another at high speeds.
4.5 billion years ago, a Mars-sized body was believed to have impacted a young Earth, and this planetesimal’s obliterated remains coalesced into what is now our Moon. However, certain striking similarities between the Earth and Moon question the likelihood of this event. Two recent papers investigated the giant impact scenario, only to come to opposite conclusions. Read on to hear more about this lunar enigma.