The Sky Tonight

February 09, 2015

The Sun's activity in the 18th century was similar to that now
Madrid, Spain (SPX) Feb 10, 2015
Counting sunspots over time helps in knowing the activity of our star but the two indices used by scientists disagree on dates prior to 1885. Now an international team of researchers has tried to standardise the historical results and has discovered that, contrary to what one may think, the solar activity of our times is very similar to that of other times, such as the Enlightenment. Scientists have been counting sunspots since 1610 with small telescopes. Thus it has been verified that the Sun's a ... read more

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Number of Known Accessible Near-Earth Asteroids Doubles Since 2010 NASA performed the first Near-Earth Object Human Space Flight Accessible Targets Study (NHATS) in September/October of 2010, and 666 of the known near-Earth asteroids (NEAs) were identified as meeti ... more		On quantum scales, there are many second laws of thermodynamics New research from UCL and the Universities of Gdansk, Singapore, and Delft has uncovered additional second laws of thermodynamics which complement the ordinary second law of thermodynamics, one of t ... more		Dark matter at the heart of our galaxy The ubiquitous presence of dark matter in the universe is today a central tenet in modern cosmology and astrophysics. Its existence in galaxies was robustly established in the 1970s with a variety o ... more
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