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What Is a Light-year?

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A light-year is a way of measuring distance, which doesn't make much sense because "light-year" contains the word "year," which is normally a unit of time. So, how does a light-year measure distance?

If you were to move all of the matter in the universe into one corner, how much space would it take up?

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If you took all of the matter in the universe and you pushed it all into one corner, how much space would it take up? I am trying to understand how much of the universe is 'empty.'

What Is the Coldest Place in the Universe?

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The coldest place in the universe exists some 5,000 light-years from Earth. Do you know where it is and what it's called?

The Largest Star in the Universe Is 1,700x Bigger Than Our Sun

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In the vast night sky, where countless stars vie for attention, one colossus reigns supreme as the largest star in the universe. Situated thousands of light-years from Earth, this celestial giant's sheer magnitude challenges our understanding of stellar physics.

How are astronomers able to measure how far away a star is?

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It turns out that measuring the distance to a star is an interesting problem! Astronomers have come up with two different techniques to estimate how far away any given star is.

Twinkle, Twinkle: The Ultimate Stars Quiz

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Stars are giant nuclear fusion reactors, and we wouldn't exist without them. Find out how much you know about these twinkling lights with our quiz.

Why Are Magnetars So Scary?

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A magnetar is a neutron star with a super-strong magnetic field. Astronomers consider them among the scariest objects in the universe, but why?

How to Find Orion's Belt in the Night Sky

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Winter is the perfect time to look for Orion's Belt in the Northern Hemisphere. If you're new to stargazing, we'll show you how to find it.

What's the Brightest Star in the Sky? Depends on the Season

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The night sky has fascinated humans for centuries, with people incorporating the countless twinkling stars into various navigation methods, cultural traditions, religious movements and more. Among these, a select few stand out to viewers here on Earth as being the biggest and brightest. But which is the brightest star in the sky?

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