If a moon is big enough and far enough from its planet, it can host its own smaller moon, called a ‘moonmoon’ — and four worlds in our solar system fit the bill.
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Category: space – Page 879
Astronauts escape malfunctioning rocket
Posted in space
In early 1999, during the halftime of a University of Washington basketball game, a time capsule from 1927 was opened. Among the contents of this portal to the past were some yellowing newspapers, a Mercury dime, a student handbook, and a building permit. The crowd promptly erupted into boos. One student declared the items “dumb.”
Such disappointment in time capsules seems to run endemic, suggests William E. Jarvis in his book Time Capsules: A Cultural History. A headline from The Onion, he notes, sums it up: “Newly unearthed time capsule just full of useless old crap.” Time capsules, after all, exude a kind of pathos: They show us that the future was not quite as advanced as we thought it would be, nor did it come as quickly. The past, meanwhile, turns out to not be as radically distinct as we thought.
In his book Predicting the Future, Nicholas Rescher writes that “we incline to view the future through a telescope, as it were, thereby magnifying and bringing nearer what we can manage to see.” So too do we view the past through the other end of the telescope, making things look farther away than they actually were, or losing sight of some things altogether.
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Six years ago, the Voyager 1 spacecraft informed scientists that it had become the first man-made object to enter interstellar space. Now, Voyager 2 has begun to return signs that its own exit from the Solar System could be coming soon.
Two of Voyager 2’s instruments have measured an increase in the number of high-energy particles called cosmic rays hitting the spacecraft, according to a NASA release. Scientists think that the heliosphere, the region of particles and magnetic fields under the Sun’s influence, blocks some cosmic rays. An increase in their rate means that the probe could be nearing the heliopause, the heliosphere’s outer boundary.
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A comparison of surveys taken of the sky years apart has revealed an empty space where a star 280 million light years away once sat.
Coded FIRST J1419+3940, records of the object hint at what would have been a violent death. Curiously, no trace of its final explosive moments can be found – but this ghostly silence has only made astronomers all the more excited.
“We compared images from old maps of the sky and found one radio source that was no longer visible today in the Very Large Array Sky Survey (VLASS),” says astronomer Casey Law from the University of California, Berkeley.
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There, engineers are doing something strange. They’re freezing computer chips to 460 degrees Fahrenheit below zero, colder than deep space, to simulate the quantum structure of the universe.
At such extreme temperatures these remarkable chips, called qubits, enable scientists to peer into the complex, uncertain interaction of particles at the atomic level — an unseen world in which seemingly contradictory results can exist simultaneously, a place where simply observing an interaction can change it. Or wreck it altogether.
“Quantum — it’s something weird,” said Mike Mayberry, Intel’s chief technology officer and general manager of Intel Labs.
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