There are cosmic events so powerful that they leave permanent marks on the fabric of the universe itself. Imagine two colossal black holes spiraling into each other, yes they send ripples in the fabric of spacetime—gravitational waves...

Since the time of the ancient Greeks, scientists have been constructing a cosmic measuring tape to measure the universe from our own backyard all the way to its ever-expanding edge: the cosmic distance ladder. In this video, we climb...

Solar eclipses don't just happen here on earth - moons of other planets also pass between those planets and the sun, resulting in various types of solar eclipses on Mars, Jupiter, Saturn, Uranus, Neptune, and even non-planets like Pluto,...

Relativity Isn't Relative

The universe is expanding – this we know from looking at red shifts of distant galaxies – but the acceleration of the universe's expansion is harder to measure. It requires measuring the change of recession velocity over time, and it's...

The search for a single number: the hubble constant, which is the rate of expansion of our universe, has consumed astronomers for generations. Finally, two powerful and independent methods have refined its measurement to unprecedented...

The power of Dark Energy may be increasing as the universe ages. Subtle clues are emerging that the accepted model for the nature of dark energy and dark matter may not be all that. We saw the first such clue recently in our recent...

Getting older means it’s likely that your eyes will have trouble focusing on things at close distances, so we are often prescribed glasses to combat this problem. But what if there were eye drops that could achieve the same results? <br/>

Considering how massive our universe is, we know the distances to cosmic objects surprisingly well. What tools and clues do scientists use to measure distances that are so enormous they sound like made-up numbers?

The universe is expanding. But how much is it expanding? Is it doing expanding the same way everywhere? And can physics actually explain the expansion?

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This video is about the international system of...

This video is chapter 7 in my series on special relativity, and it covers the idea that some things AREN'T relative: there IS a sense of absolute length and absolute time, which can be agreed upon from all moving perspectives (as...

Aatish Bhatia helped write this video! A big thanks for his help! Here's his blogref='http://www.empiricalzeal.com' target='_blank' rel='nofollow'>blog The universe is expanding – this we know from looking at red shifts of distant...

The great advances in any science tend to come in sudden leaps. April 25th of 2018 marks the beginning of just such a leap for much of astronomy. In the early hours of the morning, the Gaia mission's second data release dropped. Our...

Astronomers have gotten pretty good at calculating how fast the universe is expanding, but new measurements don’t line up with the predictions of well-tested laws of physics. Now scientists have a new question to ponder: Why are these...

Thanks to the Heising Simons Foundation ( for their support of this video, and of short range gravity research.



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Improve your understanding of molecular properties with this lesson on the fascinating property of chirality. Your hands are the secret to understanding the strange similarity between two molecules that look almost exactly alike, but are...

How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the...

Thanks to observations of galaxy redshifts, we can tell that the universe is EXPANDING! Knowing that the universe is expanding and how quickly its expanding also allows us to run the clock backwards 14 billion years to the way the...

There is more than one way to measure the same thing! Jessi and her friend The Giant Squidstravaganza (Squid for short) explore the differences between the Metric System and the Imperial System.

Samuel Morse helped invent a new way for people to communicate across great distances: the telegraph. He also created Morse code, a system of dots and dashes used to send messages quickly and clearly. Before the telephone or internet,...

Howcast - Learn how to read body language in the workplace in this Howcast video.

Howcast - Learn how to ride offensively from professional motorcycle instructor Joonil Park in this Howcast video.

When talking about raptors, you can't leave out the largest group of them all: eagles. Meet Tonka the golden eagle, a truly epic aerial predator.