Articles sur Sun

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Earth, shot from space, as it absorbs and reflects rays of light coming from the Sun - the same white-looking rays that give our sky its colour. NASA

Curious Kids: Why is the sky blue and where does it start?

Some people think the sky is blue because of sunlight reflected off the ocean and back into the sky. But that's not the real reason.
An artist’s illustration of Kappa Ceti whose stellar winds are 50 times stronger than our sun’s. Any Earth-like planet would need a magnetic field to protect its atmosphere if it was to stand a chance of hosting life. M. Weiss/CfA

What the ‘weather’ is like on a star can help in the search for life

In the search for life on other planets in the universe we need to find the right kind of star, and it needs to have the right kind of space weather.
Artist’s impression: Looking back 12.9-billion km towards the sun and the inner solar system from Sedna, one of the recently discovered minor planets in the Kuiper belt. NASA, ESA and Adolf Schaller

The long hunt for new objects in our expanding solar system

The search for new objects, including new planets, in our solar system has turned up some interesting finds. There have been a few failures over the years too.
The UV Index was created last century largely for North American and European conditions, which rarely reach the ‘extreme’ range. Andy Cross/Flickr

Health Check: what does the UV Index mean?

Alongside the day's high and low, weather reports generally contain a UV alert for a particular time. But what does it actually mean – and what should you do about it?
Intensive sun exposure for marathon runners in the middle of the day could lead to sunburn, skin cancer and cataracts. Rogan Ward/Reuters

The best time for marathon runners to get on the road

Runners have a greater risk of developing skin cancer because they are more likely have sun damage on their skin as a result of chronic sun exposure.
Keytruda® targets a protein on the surface of immune cells that stopped them from attacking the melanoma cells. Australis Photography/Shutterstock

Explainer: how does Keytruda treat melanoma and why is it so costly?

Keytruda® is the latest drug to be registered in Australia for the treatment of widespread melanoma. But we must wait to see if it meets the cost-effectiveness targets for PBS subsidisation.

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