All About Space

“The idea of a single time that passes at the same speed is completely wrong”

Carlo Rovelli,, Centre de Physique Théorique de Luminy at Aix-Marseille University

- Reported by Elizabeth Howell

“The Sun is hard to predict on even a daily basis, so it's difficult to say when a superflare would occur”

The mature Sun may still be prone to temper tantrums. A new study suggests that older stars like the Sun can produce superflare­s – huge bursts of energy visible across hundreds of light years.

Superflare­s used to be thought of as a youngersta­r phenomenon, researcher­s said in a statement about the new study, but the new work suggests it can happen on the Sun at rare intervals, perhaps once every few thousand years.

The Sun is hard to predict on even a daily basis, so it's difficult to say when a superflare would occur. However, the new work's lead scientist, Yuta Notsu, a visiting researcher at the University of Colorado Boulder, said this possibilit­y should inspire everyone to beef up electronic­s against radiation.

"If a superflare occurred 1,000 years ago, it was probably no big problem. People may have seen a large aurora," Notsu said in a statement, referring to the dancing northern or southern lights produced by solar particles interactin­g with molecules of Earth's atmosphere. "Now it's a much bigger problem because of our electronic­s."

We already know the power of the Sun can knock out power lines, electronic­s and satellites. Coronal

mass ejections from the Sun – or large plumes of charged particles – have caused issues with our infrastruc­ture in the past, such as the extraordin­ary 1859 Carrington Event superstorm that affected telegraph communicat­ions. A superflare, however, would be worse. The superflare would be hundreds or thousands of times more powerful than the most active solar flares recorded.

"If a superflare erupted from the Sun… Earth would likely sit in the path of a wave of high-energy radiation. Such a blast could disrupt electronic­s across the globe, causing widespread blackouts and shorting out communicat­ion satellites in orbit," representa­tives from the University of Colorado Boulder said in the statement.

The new superflare data came from NASA's Kepler space telescope, which looked for planets at faraway stars between 2009 and 2018. While looking for new worlds, Kepler also saw a lot of star activity. It spotted a few superflare­s, moments when the starlight would suddenly get brighter before dimming again.

Curious about Kepler's findings, the researcher­s looked to the European Space Agency's Gaia spacecraft – which studies stellar movements and brightness­es across a billion stars – and the Apache Point Observator­y in New Mexico.

The two telescopes saw 43 superflare­s that came from stars similar in age and size to our own Sun. Statistics from their data show that most superflare­s do come from younger stars, which can flare about once a week. Our own Sun is still prone, but just once every few thousand years.

 ??  ??
 ??  ?? Even in its old age the Sun has been exhibiting superflare­s
Even in its old age the Sun has been exhibiting superflare­s

Newspapers in English

Newspapers from United Kingdom