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A information to cosmic fireworks, from stellar flares to black-hole beacons

August 17, 2023
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A information to cosmic fireworks, from stellar flares to black-hole beacons
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TO HUMAN eyes, the night time sky is serene, save for the moon and some wandering planets. Peer into house with a telescope that may scan your complete sky in days, nonetheless, and it seems as an ideal cosmic fireworks show – a riot of bangs and flashes radiating throughout the electromagnetic spectrum, from radio waves to gamma rays.

Astronomers are desperate to catch these fleeting astrophysical phenomena, often known as transients, as a result of they will reveal an ideal deal concerning the universe, from what matter does in essentially the most excessive situations to how the cosmos advanced. And we’re about to see much more of them because of the Vera C. Rubin Observatory in Chile, which is anticipated to detect 10 million transients an evening when it switches on subsequent 12 months.

The difficulty is that, for the untrained observer, it may be troublesome to make sense of transients. For starters, similar-looking outbursts can have completely different origins and vice versa, such {that a} single supply can provide rise to quite a lot of astrophysical signatures. That alone could make it difficult to maintain monitor of what’s what.

Right here, then, is a concise primer that additionally serves as a information to the causes and penalties of those ephemeral illuminations – and the way, in some circumstances, they problem our understanding of the physics that governs the universe.

Stellar flares

A residing star’s electromagnetic eruptions

Let’s begin with a straightforward one. A stellar flare is an explosion within the ambiance of a star that ends in an intense flash of radiation throughout the electromagnetic spectrum. When our solar flares, for example, we see a sudden burst of brightness earlier than it rapidly …



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