Articles on Stars

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Cilcik on the image to learn how stars are made. Picture: NASA.

VIDEO: What are stars?

How are stars formed? What are they made of? And what happens to them when they die? In this week’s TCTV, astrophysicist Akila Jeeson-Daniel explains the physics behind the balls of gas that light up the…
The oldest star is out there somewhere. But which one is it? www.shutterstock.com

The oldest star in the universe? Maybe, maybe not!

There is a myth that goldfish have a three-second memory, and I sometimes wonder if the same is true about the part of the human mind that deals with science in the news. This week, the international media…
What’s going on up there? VinothChandar

Why is the sun going quiet?

The sun is our nearest star and the source of all our light and heat on Earth but recent reports have highlighted an ongoing steep decline in solar activity. This story is a reminder that our sun is a…
It may not look like much from here, but Nova Centauri 2013 - visible for the next few days - is a nuclear explosion on a dead star. NASA's Marshall Space Flight Centre

Up in the sky: it’s a nuclear explosion!

If you live in the southern hemisphere, you now can safely view the aftermath of a nuclear explosion from the comfort of your own backyard. Just last week a new “star”, Nova Centauri 2013, was discovered…
The delicate twinkling stars in the night sky are actually fusion-fuelled balls of gas. Adam Foster | Codefor

Explainer: what are stars?

Twinkle, twinkle, little star, how I wonder what you are. If we look up at the sky at night, we see millions of tiny diamond-like stars. These are actually balls of plasma (very hot gas) consisting of…
If gas clouds collided to create big stars, they might look like this during the collision. This is the RCW120 Spitzer Bubble. NASA

Milky Way’s biggest star may have had a different beginning

The current theory of star formation has a problem: it cannot make big stars. In the standard star-making recipe, stars are formed in the depths of gas clouds made from molecular hydrogen. These clouds…
The nearest stars to Earth – apart from the sun – are more than 4x1013 kilometres away. Stinger_Y_Y

Explainer: light‑years and units for the stars

Space is Big. Really Big. The Hitchhiker’s Guide to the Galaxy pretty much nailed space with those five words. And space is so really big that our earthly measures of distance struggle. The distance to…
Star clusters with an intermediate mass and large size were not known – until now. Ani-Bee

Mind the gap: filling in the missing pieces for star clusters

My colleagues and I have confirmed the existence of a new type of star cluster – as published recently in Monthly Notices of the Royal Astronomical Society. But what are star clusters, and why do they…
A new study shows only 30% of stars in a globular cluster will reach old age and become planetary nebulae. NASA

A stellar mid‑life crisis: why do some cluster stars die early?

It was written in the stars all along, but we’ve just found out: a whopping 70% of stars in a widely-studied cluster die before reaching old age which, for stars, is the most productive stage of their…
Involvement of citizen scientists meant that meant that someone, somewhere in the world, always had clear skies to be able to observe the binary star system. http://www.flickr.com/photos/29225114@N08

Crowdsourcing astronomy: how backyard stargazers helped unlock SS Cygni’s secrets

SS Cygni, a famous stellar system made up of one normal star and one dead star, is much closer than previously thought, according to a new study by Australian researchers and citizen scientists. The new…
The black hole, circled, sits in a star cluster 300 million light-years away. Sean Farrell

Scientists find evidence of first ‘middleweight’ black hole

Explosive outbursts of super-hot gas in a galaxy 300 million light-years away have provided evidence of the first known “middleweight” black hole, according to scientists who observed the plasma jets with…

Milky Way may be brimming with nomads

Our galaxy may be teeming with so-called ‘nomad planets’, which travel through space rather than orbiting stars, according…

Superfast spinning star found

The star with the fastest rotation ever recorded has been discovered by researchers at the University of California, Santa…

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