Category Astronomy/Space

Magnetic Plasma Pulses Excited by UK-size Swirls in the Solar atmosphere

The sun
Evidence of ubiquitous Alfvén pulses transporting energy from the photosphere to the upper chromosphereNature Communications, 2019; 10 (1) DOI: 10.1038/s41467-019-11495-0

An international team of scientists led by the University of Sheffield have discovered previously undetected observational evidence of frequent energetic wave pulses the size of the UK, transporting energy from the solar surface to the higher solar atmosphere.

Magnetic plasma waves and pulses have been widely suggested as one of the key mechanisms which could answer the long-standing question of why the temperature of the solar atmosphere rises dramatically, from thousands to millions of degrees, as you move away from the solar surface.

There have been many theories put forward, including some developed at ...

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Hubble Uncovers a ‘Heavy Metal’ Exoplanet shaped like a Football

This artist’s illustration shows an alien world that is losing magnesium and iron gas from its atmosphere. The observations represent the first time that so-called “heavy metals”—elements more massive than hydrogen and helium—have been detected escaping from a hot Jupiter, a large gaseous exoplanet orbiting very close to its star. WASP-121b, orbits a star brighter and hotter than the Sun. 

How can a planet be “hotter than hot?” The answer is when heavy metals are detected escaping from the planet’s atmosphere, instead of condensing into clouds.

Observations by NASA’s Hubble Space Telescope reveal magnesium and iron gas streaming from the strange world outside our solar system known as WASP-121b...

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TESS Satellite uncovers its ‘First nearby Super-Earth’

Credit: © sdecoret / Adobe Stock

NASA’s Transiting Exoplanet Survey Satellite (TESS), a mission designed to comb the heavens for exoplanets, has discovered its first potentially habitable world outside of our own solar system – and an international team of astronomers has characterized the super-Earth, about 31 light-years away, named GJ 357 d.

“This is exciting, as this is TESS’s first discovery of a nearby super-Earth that could harbor life – TESS is a small, mighty mission with a huge reach,” said Kaltenegger, associate professor of astronomy, director of Cornell’s Carl Sagan Institute and a member of the TESS science team.

The exoplanet is more massive than our own blue planet, and Kaltenegger said the discovery will provide insight into Earth’s heavyweight planetary cousins...

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The Moon is Older than Previously Believed

This image shows what the collision between Earth and Theia might have looked like. Image: Hagai Perets
This image shows what the collision between Earth and Theia might have looked like. Image: Hagai Perets

Fifty years after the first landing on the Moon, scientists have combined new geochemical information to determine the Moon’s age using samples from different Apollo missions. After the formation of the solar system, 4.56 billion years ago, the Moon formed approximately 4.51 billion years ago. The new study has thus determined that the Moon is significantly older than previously believed – earlier research had estimated the Moon to have formed approximately 150 million years after solar system’s formation. To achieve these results, the scientists analysed the chemical composition of a diverse range of samples collected during the Apollo missions...

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