Category Astronomy/Space

Cold, Dry Planets could have a Lot of Hurricanes

Dust storms on Mars could behave similarly to dry cyclones. (NASA/JPL/Malin Space Science Systems photo) 

Study overturns conventional wisdom that water is needed to create cyclones. Nearly every atmospheric science textbook ever written will say that hurricanes are an inherently wet phenomenon – they use warm, moist air for fuel. But according to new simulations, the storms can also form in very cold, dry climates.

A climate as cold and dry as the one in the study is unlikely to ever become the norm on Earth, especially as climate change is making the world warmer and wetter. But the findings could have implications for storms on other planets and for the intrinsic properties of hurricanes that most scientists and educators currently believe to be true.

“We have theories for how hurr...

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Astronomers Map Vast Void in our Cosmic Neighborhood

Map showing the local void
A smoothed rendition of the structure surrounding the Local Void. Our Milky Way galaxy lies at the origin of the red-green-blue orientation arrows (each 200 million lightyears in length). We are at a boundary between a large, low density void, and the high density Virgo cluster. 
Credit: R. Brent Tully

An astronomer from the University of Hawaii Institute for Astronomy and an international team published a new study that reveals more of the vast cosmic structure surrounding our Milky Way galaxy.

The universe is a tapestry of galaxy congregations and vast voids...

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Astronomers make 1st Calculations of Magnetic activity in ‘hot Jupiter’ exoplanets

This illustration shows a hot Jupiter orbiting so close to a red dwarf star that the magnetic fields of both interact, triggering activity on the star. Astrophysicists have for the first time used observations of such activity to calculate field strengths in four hot Jupiter star-and-planet systems. Image credit: NASA, ESA and A. Schaller (for STScI)

Gas-giant planets orbiting close to other stars have powerful magnetic fields, many times stronger than our own Jupiter, according to a new study by a team of astrophysicists. It is the first time the strength of these fields has been calculated from observations.

The team, led by Wilson Cauley of the University of Colorado, also includes associate professor Evgenya Shkolnik of Arizona State University’s School of Earth and Space Expl...

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The Early Days of the Milky Way revealed

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The Early Days of the Milky Way revealed

A study puts a sequence to the events which gave rise to our Galaxy. The universe 13,000 million years ago was very different from the universe we know today. It is understood that stars were forming at a very rapid rate, forming the first dwarf galaxies, whose mergers gave rise to the more massive present-day galaxies, including our own. However the exact chain of the events which produced the Milky Way was not known until now.

Exact measurements of position, brightness and distance for around a million stars of our galaxy within 6,500 light years of the sun, obtained with the Gaia space telescope, have allowed a team from the IAC to reveal some of its early stages...

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