The reason we have seasons is because, during its journey around the Sun, the Earth is tilted.
The Blackfeet always faced their tipis towards the rising sun, including on winter solstice.
Beinecke Library via Wikimedia Commons
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 comet-gazing opportunity to close out the year.
I MAKE PHOTO 17/Shutterstock.com
A bright comet visible in December provides an excellent viewing opportunity for night sky lovers – even potentially with the naked eye.
Both Voyagers are now in interstellar space.
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.
Solar flares captured on the Sun.
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.
The Sun is a star – but it’s not the only one.
NASA/GSFC/Solar Dynamics Observatory
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.
A coronal mass ejection erupts from the sun in 2012.
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.
time of moonrise and moonset and the shape of the Moon change throughout the month.
Marcella Cheng/The Conversation
When and where you see the Moon in the daytime depends on what phase it is in.
Sunscreen protects from skin cancer, burning and from the sun’s ageing effects.
PRONicki Dugan Pogue/Flickr
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?
Sunrise over Brisbane.
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.
A huge solar flare flashes in the middle of the sun on Sept. 6, 2017. A separate image of the Earth provides scale.
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?
Two spacecraft concepts for the Plato mission.
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.
A total solar eclipse will be visible across parts of the United States Aug. 21, treating amateur and professional astronomers alike to sights similar to this NASA’s Solar Dynamics Observatory ultraviolet image of the moon eclipsing the sun on Jan. 31, 2014.
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.
While Mercury is indeed very hot, it is not hot enough to melt.
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.
Have telescopes, will travel: English astronomers await an 1871 eclipse in India.
The Illustrated London News, 1872
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.
The sun by the Atmospheric Imaging Assembly of NASA’s Solar Dynamics Observatory.
Gravity waves recorded in the sun for the first time reveal some interesting facts.
A solar eclipse observed over Grand Canyon National Park in May 2012.
Grand Canyon National Park
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.