The reason we have seasons is because, during its journey around the Sun, the Earth is tilted.
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Articles on Sun
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For indigenous peoples, winter solstice has been a time to honor their ancient sun deity. Their rituals reveal a deep understanding of the natural world.
A bright comet visible in December provides an excellent viewing opportunity for night sky lovers – even potentially with the naked eye.
Voyager 2 launched in 1977 and visited all four gas giants in our Solar System. It’s now almost 18 billion kilometres from Earth and has finally joined its twin in interstellar space.
When dozens of US mines planted in waters off the Vietnam coast detonated almost simultaneously in 1972, all eyes turned to the Sun for an explanation.
There are lots of places where it’s much, much hotter than the Sun. And the amazing thing is that this heat also makes new atoms - tiny particles that have made their way long ago from stars to us.
Technology can only go so far in making sense of our vast and intricate atmosphere.
A gardening expert reveals the simple things you can do to protect your garden during a heatwave.
The wired Earth of the 21st century is at the mercy of the volatile nature of the sun.
Cosmic radiation is much higher today than it was during the Apollo era.
When and where you see the Moon in the daytime depends on what phase it is in.
Whenever summer rolls around, it’s easy to forget the basics of sunscreen. How long should I wait after applying it to go in the sun, and how long can I stay in the sun with it on?
A solar day is a measure of how long it takes the Earth to rotate from one noon to the next, and today’s summer solstice also happens to be the longest solar day of the year.
At a time in the sun’s cycle when space weather experts expect less solar activity, our star is going bonkers with solar flares and coronal mass ejections. What effects will Earth feel?
While we on Earth are familiar with our own star, the Sun, the European Space Agency’s PLATO mission will explore solar systems similar to ours as well as those that are more exotic.
If you’ve ever wondered why you can look at a solar eclipse and why it can harm your eyes, the answer is in the sun’s rays.
The planets closer to the Sun are indeed hotter than the Earth is. But they are still not hot enough to melt the rocks they are made from.
For centuries, scientists have known when and where eclipses will be visible. They pack their bags, head for the line of totality and hope for the best – which doesn’t always happen.
Gravity waves recorded in the sun for the first time reveal some interesting facts.
More than 2,000 years ago, the Babylonians understood the cycle of eclipses. They also regarded them as signs that could foretell the death of a king.
Top contributors
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Senior Curator (Astronomy), Museums Victoria and Honorary Fellow at University of Melbourne, Museums Victoria Research Institute
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Senior Lecturer in Physics, Nottingham Trent University
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Director of the Abrams Planetarium, Michigan State University
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Associate Professor, RMIT University
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Post Doctoral Research Fellow in Space Science, University of Birmingham
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Reader in Physical Sciences, Aberystwyth University
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Professor (Astrophysics), University of Southern Queensland
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University Distinguished Professor of Astronomy, University of Arizona
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Professor (Physics), University of Southern Queensland
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Teaching Professor, Department of Astronomy & Astrophysics, Penn State
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Professor of Physics, UCL
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Adjunct Professor, School of Psychology, Curtin University and College of Health and Medicine, Australian National University
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Head, Department of Medicine, School of Clinical Sciences; Professor of Medicine, Monash University
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Associate Professor, The University of Melbourne
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Chief Specialist Scientist (Public Health), South African Medical Research Council
