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PBS Space Time

Will the Universe Expand Forever?

Throughout history, there has been much speculation about what the fate of the universe would be. Many theorized that the universe would eventually succumb to the pull of gravity, and reverse its expansion in what was being called ‘The Big Crunch.’ However, with the help of mathematical equations from Newton, Einstein, and Alexander Friedmann, we now have an answer.

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LIGO's First Detection of Gravitational Waves!
7:29
Gravitational waves have officially been detected by LIGO!
Can We Survive the Destruction of the Earth?
10:34
What do we do to protect ourselves from extinction level events?
Will Mars or Venus Kill You First?
8:44
Our neighboring planets are not exactly the most hospitable places.
The Quantum Experiment that Broke Reality
10:27
The double slit experiment radically changed the way we understand reality.
The Origin of Matter and Time
9:21
Time to redefine our preconceived notions about mass and time.
The Future of Gravitational Waves
5:49
In 2015 LIGO announced the first detection of a gravitational wave... What happens next?
When Time Breaks Down
8:04
We learned how motion gives matter its mass, but how does motion affect time?
Juno to Reveal Jupiter's Violent Past
10:15
On July 4th 2016, the Juno spacecraft finally entered orbit around the planet Jupiter.
The True Nature of Matter and Mass
8:34
Are matter, mass, and time real?
Planck's Constant and The Origin of Quantum Mechanics
11:02
Planck's Length is the length below which the concept of length loses its meaning. Huh?
The Higgs Mechanism Explained
7:49
What is the Higgs field and why is it a fundamental part of our universe?
The Strange Universe of Gravitational Lensing
9:42
Contrary to how we perceive reality, spacetime is deflected through the lens of gravity
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