I admit, I love flipping through SkyMall when I’m on airplanes. However, the catalog is chock-full of pseudoscience, as with today’s entry in “As Seen on TV!”, my occasional feature over at Double X Science. (Warning: contains my balding scalp.)
Ah, lasers. They may not have the mystique of magnets or the nous of “natural”, but they are a frequent ingredient in modern snake oil. (Come to think of it, one of the hair-restoration products may have contained snake oil. I don’t want to ask.) But while lasers can help correct nearsightedness in some cases, perform minimally invasive surgeries, and remove hair, color my scalp skeptical about their ability to restore hair. [Read more...]
The long jet of gas in the galaxy M87, which is driven by the supermassive black hole at the galaxy’s center. New observations have revealed the structure of the gas disk near the black hole.
A collection of four big telescopes in Arizona, California, and Hawaii have banded together to examine one of the biggest black holes we know: the beast at the heart of the galaxy M87. What they found: the disk of gas driving M87’s huge jet rotates the same direction as the black hole that made it.
New observations from the Event Horizon Telescope (actually an array of four millimeter-wave telescopes working in concert) have revealed the best view so far of the supermassive black hole in the galaxy M87. As described in a Science paper, astronomers measured the motion of gas to a distance approximately 5.5 times the event horizon radius. That is close enough to confirm the gas circles in the same direction the black hole itself rotates. These observations help clarify the origin of the powerful jet of gas streaming from the galaxy’s center at a high fraction of the speed of light: it is likely driven by the swirling matter near the black hole’s boundary. [Read more....]
The dark matter problem is famous: about 80% of all mass in the Universe is invisible to light. However, a lot of regular matter is also “missing”, in the sense that we know it exists, but haven’t determined where it’s located. Measurements of the cosmic microwave background have shown how many atoms there are in the Universe, but they aren’t in galaxies. A new observation using the Chandra X-ray Observatory may show that at least some of the missing atoms are in giant hot gas clouds surrounding galaxies.
If the atoms were uniformly distributed around the galaxy, then they would make a sphere over 600 thousand light-years across, about six times the diameter of the Milky Way’s disk. Since the atoms are almost certainly not in a uniform cloud, the actual size of the cloud can’t be known, so the researchers weren’t able to determine whether the oxygen was in the CGM or the IGM. Either way, it is consistent with theoretical predictions. [Read more....]
Quasars are some of the brightest objects in the Universe—powerful jets emanating from supermassive black holes as they gorge on gas. However, their light is irregular, both varying in brightness between different quasars and fluctuating in time. A new analysis may have found regularities within those fluctuations, which might allow them to be used as standard candles: objects whose intrinsic properties are known, and therefore can be used to measure large distances in space.
The researchers then fitted straight lines to periods of flux increase and decrease longer than 90 days. They found the slopes of these lines to be nearly the same. While the amount and duration of the change in flux differed, the rate of change in flux was similar. (This is analogous to comparing several cars with different top speeds, but the same acceleration capabilities). The data points were scattered, but still showed a clear trend: the quasars all seemed to vary in their light output at a certain rate, independent of their distance from Earth. [Read more....]
I’m currently in San Francisco for my younger brother’s wedding, but that doesn’t stop me from providing science content to you, dear readers. (Ahem.) Researchers have figured out a way to read and manipulate the quantum spin state of a single electron—a classic example in quantum computing that up until now has existed only in theoretical calculations.
By embedding a phosphorous atom in silicon, the researchers used this contrast to isolate the properties of a single electron orbiting the atom. They massaged the electron spin into a particular state using microwaves to drive the system. Varying the microwave pulses, the researchers could cause the electron spin to flip in a controlled fashion. [Read more....]
(Yes, my Spanish sucks.) The Dawn mission found signs of volatile materials—including water and elemental hydrogen—on the surface of the asteroid Vesta. Since Vesta is likely the source of a particular type of meteorite on Earth, the presence of volatiles was surprising, but intriguing. Vesta is remarkably like the terrestrial worlds (Mercury, Venus, Earth, Mars, and the Moon), with a layered internal structure and interesting surface features, so the probable discovery of water further hints at its connection to the planets.
The presence of volatiles on the asteroid—and especially hydrogen—suggests they were added to the asteroid later. This implies a common source for Earth’s and Vesta’s water, further cementing Vesta’s status as a terrestrial world in its own right. [Read more....]