The world’s smallest optical space telescopes to launch on Monday.
The world’s smallest optical space telescopes to launch on Monday.
Tag: science
Mammoth Cave is now officially longer than 400 miles.
Mammoth Cave is now officially longer than 400 miles.
This official announcement is a bit old, as the survey work that brought Mammoth over 400 miles was probably done during the October or December 2012 expeditions.
Update: I contacted some of my caving friends who survey in Mammoth regularly, and they have confirmed that the survey reached 400 miles during the October 2012 expedition.
R.I.P. Dr. David S. McKay: 1936-2013
R.I.P. Dr. David S. McKay: 1936-2013. More here.
Though he was most famous for being the lead author of the 1996 paper suggesting that fossil life had found in a Martian meteorite, McKay was one of the giants of planetary science whose work was far more extensive and important. He will be missed.
New data has allowed scientists to lower the chance that the asteroid Apophis will hit the Earth in a future orbit.
New data has allowed scientists to lower the chance that the asteroid Apophis will hit the Earth in a future orbit.
Recent observations from Pan-STARRS PS1 telescope at Haleakala, Hawaii have reduced the current orbital uncertainty by a factor of 5, and radar observations in early 2013 from Goldstone and Arecibo will further improve the knowledge of Apophis’ current position. However, the current knowledge is now precise enough that the uncertainty in predicting the position in 2029 is completely dominated by the so-called Yarkovsky effect, a subtle nongravitational perturbation due to thermal re-radiation of solar energy absorbed by the asteroid. The Yarkovsky effect depends on the asteroid’s size, mass, thermal properties, and critically on the orientation of the asteroid’s spin axis, which is currently unknown. This means that predictions for the 2029 Earth encounter will not improve significantly until these physical and spin characteristics are better determined.
The new report, which does not make use of the 2013 radar measurements, identifies over a dozen keyholes that fall within the range of possible 2029 encounter distances. Notably, the potential impact in 2036 that had previously held the highest probability has been effectively ruled out since its probability has fallen to well below one chance in one million. Indeed only one of the potential impacts has a probability of impact greater than 1-in-a-million; there is a 2-meter wide keyhole that leads to an impact in 2068, with impact odds of about 2.3 in a million.
The second paragraph basically says that the keyholes that might bring Apophis back to Earth are very small, making it unlikely that the asteroid will fly through any one of them in 2029. The first paragraph however notes that it will be impossible to chart the asteroid’s course accurately enough to rule out this possibility until we have more data on the asteroid itself.
In an interview in Australia, the head of the IPCC has admitted that the climate has stopped warming now for the past seventeen years.
Consensus! In an interview in Australia, the head of the IPCC has admitted that the climate has stopped warming now for the past seventeen years.
No computer climate model offered in any IPCC report predicted this long pause in warming. They all instead insisted that because of the increase of carbon dioxide in the atmosphere, the global temperature would have to rise, and do so quickly and with catastrophic results.
In other words, those models were wrong. The climate is very complicated, and we don’t yet understand very well how it functions.
Using Kepler scientists have discovered a three planet solar system with one planet slightly larger than our Moon.
Using Kepler astronomers have discovered a three planet solar system with one planet slightly larger than our Moon.
Kepler-37’s host star belongs to the same class as our sun, although it is slightly cooler and smaller. All three planets orbit the star at less than the distance Mercury is to the sun, suggesting they are very hot, inhospitable worlds. [The moon-sized] Kepler-37b orbits every 13 days at less than one-third Mercury’s distance from the sun. The estimated surface temperature of this smoldering planet, at more than 800 degrees Fahrenheit (700 degrees Kelvin), would be hot enough to melt the zinc in a penny. Kepler-37c and Kepler-37d, orbit every 21 days and 40 days, respectively.
Scientists have released some results from their look at asteroid 2012 DA14 during its fly-by last week.
Scientists have released some results, including video, from their look at asteroid 2012 DA14 during its fly-by last week. Key quote:
The asteroid’s path was perturbed by Earth’s gravitational field in such a way that it won’t come as close in the foreseeable future.
The video, which I have embeded below the fold, was produced from radar data. It clearly shows the asteroid’s rotation.
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A new poll of Earth scientists has found that a majority are skeptical of human-caused global warming.
Consensus! A new poll of Earth scientists has found that a majority are skeptical of human-caused global warming.
Only 36 percent of geoscientists and engineers believe that humans are creating a global warming crisis, according to a survey reported in the peer-reviewed Organization Studies. By contrast, a strong majority of the 1,077 respondents believe that nature is the primary cause of recent global warming and/or that future global warming will not be a very serious problem.
This is fun to note, but this poll is as worthless in determining the climate of the Earth as every previous poll that said the opposite. What matters is the data. However, this quote about the poll is significant:
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Some thoughts by Alan Stern on a better way to name exoplanets.
Some thoughts by Alan Stern on a better way to name exoplanets.
Mercury, in full color.
Mercury, in full color.
Scientists working with NASA’s Messenger probe have produced a global color map of the surface of Mercury, closest planet to the Sun. Thousands of sets of images were enhanced then stitched together in a mosaic to create a detailed image covering the entire planet.
Russian scientists have identified the first fragments from Friday’s meteorite in Chelyabinsk.
Russian scientists have identified the first fragments from Friday’s meteorite in Chelyabinsk.
The pieces, found on the ice of a lake, were stony chondrites.