Mystery of Martian trenches solved
This week, researchers at the University of Texas at Austin (UT) published a paper analyzing 262 craters on Mars that were once believed to house ancient lakes or seas, and discovered that these may be the key to understanding Mars’ heavily scarred surface.
According to the paper, these crater lakes would exert so much pressure on the walls of the crater, which extended high above the surrounding region, that eventually these walls would rupture, dumping out nearly the entirety of the water contained within them in fast-moving, violent floods.
“They greatly varied in terms of their volumes,” Tim Goudge, an assistant professor at UT’s Jackson School of Geosciences and lead author of the paper told us earlier this week, “but some were the size of small seas on Earth (e.g., Caspian Sea).”
These massive lakes or seas would empty out in as soon as a few weeks, and the amount of sediment the rushing waters carved out of the Martian surface was incredible.
“When you fill [the craters] with water, it’s a lot of stored energy there to be released,” Goudge said. “It makes sense that Mars might tip, in this case, toward being shaped by catastrophism more than the Earth.”
An intermediate-mass black hole has finally been found
- stellar-mass black holes
- supermassive black holes
Intermediate-mass black hole
A team of researchers at the University of Arizona (UA) analyzed records of a previous flare from a tidal disruption event – where a star gets torn to shreds by the gravity of a black hole and emits powerful X-rays in the process – and were able to deduce both the spin and the mass of the black hole that caused it. According to their calculations, the black hole weighed in at about 10,000 solar masses.
“The fact that we were able to catch this black hole while it was devouring a star offers a remarkable opportunity to observe what otherwise would be invisible,” said Ann Zabludoff, a professor of astronomy at UA and co-author of the paper. “Not only that, by analyzing the flare we were able to better understand this elusive category of black holes, which may well account for the majority of black holes in the centers of galaxies.”
Human mind’s resemblance to mathematical fractals
Dartmouth College researchers had volunteers listen to a 10-minute short story and analyzed the patterns of activity in the brain’s network of neurons and found that these patterns looked a lot like fractals.
“To generate our thoughts, our brains create this amazing lightning storm of connection patterns,” Jeremy R. Manning, assistant professor of psychological and brain sciences at Dartmouth and the paper’s senior author, said.
“The patterns look beautiful, but they are also incredibly complicated. Our mathematical framework lets us quantify how those patterns relate at different scales, and how they change over time.”
Yet another planet out beyond Neptune?
Astronomers, using powerful computer simulations, now say there is about a 50% chance that a rocky planet was dragged out of the inner solar system by the outer gas giants and effectively used as a gravitational foothold for the gas giants to achieve their current positions and orbits – and shoving the rocky Mars-sized planet out into the Kuiper Belt, if not out of the solar system entirely, in the process.
“Our simulations found that in about half of the cases, all of the Mars-scale planets in the outer Solar System were ejected into interstellar space,” said Scott Tremaine, of the Institute for Advanced Study in Princeton, New Jersey. “But in the remaining half, one ‘rogue’ planet was left in an orbit similar to that of the detached population of Kuiper Belt objects.”
Whether such an object can be found will be tricky, but if true, then there could be even more mysteries out in the Kuiper Belt than we originally thought.
A colossal comet ever found heading for sun
The comet Bernardinelli-Bernstein is making its second trip through the solar system after about a 3.5-million-year hiatus, and it’s the largest comet we’ve ever seen.
First discovered in June 2021, Bernardinelli-Bernstein is believed to be somewhere between 60 and 120 miles wide (about 100 to 160 km) and was originally thought to be a dwarf planet when it was first spotted in the vicinity of Neptune from an image taken in 2014.
Now closer to Uranus, the comet has already sprung a tail, the farthest comet to ever be seen doing so. The fact that it is so large indicates that this might be one the second time the comet has made its way through the solar system.
“It’s very rare to see big comets basically because unless you’re catching it in its first or second passage, most of its material would already be gone,” Bernardinelli said.
The loss of material comes from their approaching the sun. Since comets are effectively gigantic snowballs in space, getting close to the sun melts the ice around their core and produces their spectacular tails. This melting also reduces their mass each time they pass through the inner solar system.
The nearest Bernardinelli-Bernstein will come to Earth will be about 11 AU, or 11 times the distance Earth is from the sun, which puts it just outside the orbit of Saturn and far enough from us that it isn’t a threat to us, at least not this go around. If it were to hit us though, boy howdy, Earth would be in for a world of hurt.
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