An artist’s concept of an astronaut walking on Mars. But what would happen if the astronaut weren’t wearing a space helmet?
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Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
Don’t call them tentacles: An octopus has eight arms.
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With nine brains, blue blood and a talent for camouflage, the octopus is one of the most fascinating creatures in the sea.
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The value of digital art or other digital objects depends on how much someone is willing to pay for it.
A tornado in Turkey, Texas.
Jana Houser
You can’t photograph the inside of a twister, but radar offers some clues.
The red and stormy planet.
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The biggest storm on Jupiter is so big it could swallow all of Earth. But it’s now shrinking, and we’re not sure what that means.
The depths of the valleys on a key act like a code that must match the lock.
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A computer security expert explains how keys work – and how they are like passwords.
The Earth viewed from the Apollo 8 lunar mission on Dec. 24, 1968.
NASA
The Earth is a resilient planet, but people are altering it in ways that may take centuries to reverse.
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From fibre to fabric. The process of making textiles has been important to humans for almost 35,000 years.
The same thing that makes their eyes glow helps cats see better in dim light.
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A veterinary ophthalmologist explains what’s going on.
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Scientists have come up with a number of theories about the multiverse.
Pluto, the largest of the dwarf planets. This image was taken by NASA’s New Horizons spacecraft.
NASA/JHUAPL/SwRI
The dwarf planets in our Solar System are cold, dark, far away and full of surprises.
Artist’s rendering of the Chicxulub asteroid entering Earth’s atmosphere 66 million years ago, triggering events that caused a mass extermination.
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Cockroaches have been on Earth far longer than humans and may outlast us. Here are a few reasons why.
English theatrical productions had all-male casts in the olden days.
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It may have had something to do with protecting female purity. No official statute clearly required men to do all the acting back then.
Children march in a parade marking the 70th anniversary of the end of the Second World War, in Rostov-on-Don, Russia, about 100 kilometres east of the Ukraine border, in May 2015.
(AP Photo)
Russian President Vladimir Putin wants parts of Ukraine to be closer to Russia, and would like to prevent Ukraine from becoming part of NATO.
Murmurations can have as many as 750,000 birds flying in unison.
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These coordinated movements of a flock of starlings follow no plan or leader. Scientists used to think the animals must communicate via ESP to create these fast-moving blobs.
A life reconstruction of one of the largest penguins that ever lived, Kumimanu biceae .
Illustration by Mark Witton (used with permission, all other rights reserved)
Some penguins would have been as tall (or even taller) than adults today.
Memorial tanks at the Ukrainian Motherland Monument in Kyiv.
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Who are the Ukrainians and when were they part of the same empire as Russia? A scholar answers basic questions on war in Ukraine.
Listening to music can be a joyful experience.
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As long as you don’t tune out the world and protect your hearing, it’s hard to overdo it.
A fragment of mosaic showing February from the Sousse mosaic calendar.
© Ad Meskens / Wikimedia Commons
The answer comes from how the Romans measured the year.
Ramon Espinosa/AAP Image
Scientists need to be good at asking questions, investigating the world to find answers, and keeping in mind that no matter how much they know, there’s always more to learn.