Tracking the orbit of the exoplanet in Fomalhaut’s debris disk
Tracking the orbit of the exoplanet in Fomalhaut’s debris disk.
Tag: science
Want to learn something of the geology of the Grand Canyon?
Want to learn something of the geology of the Grand Canyon? The Geological Society of America has just published a special volume of papers, with the introductory and afterword [pdf] chapters available online.
Those two chapters provide a very good layman’s summary of the geological state-of-the-art of the Grand Canyon. Very worthwhile reading if you plan to hike down in the near future.
Scientists now think it is possible for there to be floating methane ice on the lakes of Titan.
Scientists now think it is possible for there to be floating methane ice on the lakes of Titan.
Up to this point, Cassini scientists assumed that Titan lakes would not have floating ice, because solid methane is denser than liquid methane and would sink. But the new model considers the interaction between the lakes and the atmosphere, resulting in different mixtures of compositions, pockets of nitrogen gas, and changes in temperature. The result, scientists found, is that winter ice will float in Titan’s methane-and-ethane-rich lakes and seas if the temperature is below the freezing point of methane — minus 297 degrees Fahrenheit (90.4 kelvins). The scientists realized all the varieties of ice they considered would float if they were composed of at least 5 percent “air,” which is an average composition for young sea ice on Earth. (“Air” on Titan has significantly more nitrogen than Earth air and almost no oxygen.)
The Kepler science team today revealed an additional 461 candidate exoplanets, with four being less than twice Earth’s size and in the habitable zone.
Worlds without end: The Kepler science team today revealed an additional 461 candidate exoplanets, with four being less than twice Earth’s size and in the habitable zone.
Since the last Kepler catalog was released in February 2012, the number of candidates discovered in the Kepler data has increased by 20 percent and now totals 2,740 potential planets orbiting 2,036 stars. The most dramatic increases are seen in the number of Earth-size and super Earth-size candidates discovered, which grew by 43 and 21 percent respectively. The new data increases the number of stars discovered to have more than one planet candidate from 365 to 467. Today, 43 percent of Kepler’s planet candidates are observed to have neighbor planets.
Of these candidates, 105 have so far been confirmed to be exoplanets by other methods.
Note that these Kepler planets are in addition to the fifteen new exoplanets noted in my previous post.
Fifteen more exoplanets found orbiting their stars in the habitable zone.
Fifteen more exoplanets have been found, orbiting their stars in the habitable zone.
The Sun crashes
NOAA today released its newest monthly update of the Sun’s sunspot cycle and, as I do every month, I have posted the latest graph, with annotation, below the fold.
The sunspot numbers for December were not only startlingly low, they actually plunged to levels not seen since May 2011, at a time when the Sun is supposed to be approaching sunspot maximum and the number of sunspots is supposed to be increasing.
» Read more
How to make an indestructible snow fort.
How to make an indestructible snow fort.
On Wednesday Apophis will pass the Earth at a distance of 9 million miles, allowing astronomers to gather more data about this asteroid’s orbit and composition.
On Wednesday Apophis will pass the Earth at a distance of 9 million miles, allowing astronomers to gather more data about this asteroid’s orbit and composition.
Having crossed outside Earth’s orbit, Apophis will appear briefly in the night-time sky. Wednesday 9 January will afford astronomers the rare opportunity to bring a battery of telescopes to bear: from optical telescopes to radio telescopes to the European Space Agency’s Infrared Space Observatory Herschel. Two of the biggest unknowns that remain to be established are the asteroid’s mass and the way it is spinning. Both of these affect the asteroid’s orbit and without them, precise calculations cannot be made.
What happens when you set fire to 2,500 ping pong balls?
An evening pause:
Curiosity spots a Martian “flower.”
Curiosity spots a Martian “flower.”
Actually, Ian O’Neill notes, it isn’t really a flower but a very interesting geological formation embedded in the rock.
Swift demonstrates what a small 11-inch telescope can do in space with an spectacular gallery of images.
Swift demonstrates what a small 11-inch telescope can do in space with an spectacular gallery of images. The complete gallery can be seen here.