Is this meteorite from Mercury? Some scientists now say no.
The uncertainty of science: Is this meteorite from Mercury? Some scientists now say no.
Tag: science
World’s Roundest Object!
An evening pause:
Nude crashing stars spark radiation bursts.
Astronomy headline of the year: Nude crashing stars spark radiation bursts.
The location of the volcanoes on Titan are not where scientists had expected them to be.
The uncertainty of science: The location of the volcanoes on Titan are not where scientists had expected them to be.
As Io moves closer to Jupiter, the planet’s powerful gravity pulls hard on the moon, deforming it. This force decreases as Io retreats, and the moon bounces back. This cycle of flexing creates friction in Io’s interior, which in turn generates enormous amounts of volcano-driving tidal heat. Common sense suggests that Io’s volcanoes would be located above the spots with the most dramatic internal heating. But Hamilton and his colleagues found that the volcanoes are significantly farther to the east than expected.
Many of the news headlines, including the article above, have trumpeted how the volcanoes on Io are in the wrong place. (See also this article.) Not. The theories were wrong, not the volcanoes. Nature does what it wants to do. It is our job to figure out why.
Was a meteorite found in Africa in 2012 originally from Mercury?
Was a meteorite found in Africa in 2012 originally from Mercury?
Using Hubble astronomers have confirmed that it was a yellow supergiant star that was the progenitor for the nearest supernovae in decades that occurred in 2011.
Using Hubble astronomers have confirmed that it was a yellow supergiant star that was the progenitor for the nearest supernovae in decades, that occurred in 2011 in the Whirlpool Galaxy.
The uncertainty of science: As I noted in 2011 when the yellow supergiant was first detected in pre-explosion images. no theory at that time had ever proposed this kind of star as a supernova progenitor. The discovery has thus required the theorists to come up with new theories.
The scientists who attempted to re-invent Michael Mann’s hockey stick global warming graph and were caught fudging their data have admitted their data is worthless
The scientists who attempted to re-invent Michael Mann’s hockey stick global warming graph and were caught fudging their data have essentially admitted that their data is worthless.
This is what they say in a FAQ they have added to their paper:
Q: What do paleotemperature reconstructions show about the temperature of the last 100 years?
A: Our global paleotemperature reconstruction includes a so-called “uptick” in temperatures during the 20th century. However, in the paper we make the point that this particular feature is of shorter duration than the inherent smoothing in our statistical averaging procedure, and that it is based on only a few available paleo-reconstructions of the type we used. Thus, the 20th century portion of our paleotemperature stack is not statistically robust, cannot be considered representative of global temperature changes, and therefore is not the basis of any of our conclusions. [emphasis mine]
They are basically admitting that the data used to create the temperature rise of their hockey stick during the past 100 years is unreliable and therefore useless for scientific purposes. Which raises the question: Why did they publish it in the first place? See especially this analysis of this paper and the press’s reaction to it by climate scientists Roger Pielke.
Hubble sees the most distant supernova ever.
Hubble sees the most distant supernova ever.
You can read the actual paper here.
The Alpha Magnetic Spectrometer on ISS has detected a surplus of positrons, anti-matter electrons, that physicists believe are caused by the existence of dark matter.
The Alpha Magnetic Spectrometer on ISS has detected a surplus of positrons, anti-matter electrons, that physicists believe are caused by the existence of dark matter.
The lead scientist of the experiment also emphasized that dark matter is not the only possible explanation, and that “The detailed interpretation of our data probably will have many theories.”
10 More Amazing Science Stunts
An evening pause: I especially like the trick where you pick up a penny from the bottom of a dish filled with water, without getting wet.
New computer simulations suggest that the spiral arms of galaxies are not only a natural phenomenon but that they are a persistent one.
New computer simulations suggest that the spiral arms of galaxies are not only a natural phenomenon but that they are a persistent one.
Astronomers watch the central supermassive black hole of a galaxy eat something, either a planet or a brown dwarf.
Astronomers watch the central supermassive black hole of a galaxy eat something, either a planet or a brown dwarf.
Astronomers were using Integral to study a different galaxy when they noticed a bright X-ray flare coming from another location in the same wide field-of-view. Using XMM-Newton, the origin was confirmed as NGC 4845, a galaxy never before detected at high energies. Along with Swift and MAXI, the emission was traced from its maximum in January 2011, when the galaxy brightened by a factor of a thousand, and then as it subsided over the course of the year. “The observation was completely unexpected, from a galaxy that has been quiet for at least 20–30 years,” says Marek Nikolajuk of the University of Bialystok, Poland, lead author of the paper in Astronomy & Astrophysics.
By analysing the characteristics of the flare, the astronomers could determine that the emission came from a halo of material around the galaxy’s central black hole as it tore apart and fed on an object of 14–30 Jupiter masses. This size range corresponds to brown dwarfs, substellar objects that are not massive enough to fuse hydrogen in their core and ignite as stars. However, the authors note that it could have had an even lower mass, just a few times that of Jupiter, placing it in the range of gas-giant planets.
All the instruments listed above are orbiting space telescopes. You can read the science paper here.