Misconceptions About the Universe • 2014 • Veritasium

Category: Astronomy
Download:

The expanding universe is a complicated place. During inflation the universe expanded faster than light, but that's something that actually happens all the time, it's happening right now. This doesn't violate Einstein's theory of relativity since nothing is moving through space faster than light, it's just that space itself is expanding such that far away objects are receding rapidly from each other. Common sense would dictate that objects moving away from us faster than light should be invisible, but they aren't. This is because light can travel from regions of space which are superluminal relative to us into regions that are subluminal. So our observable universe is bigger than our Hubble sphere - it's limited by the particle horizon, the distance light could travel to us since the beginning of time as we know it.

Veritasium • 2014 • 2 episodes •

Can You Solve This?
4:43
Can You Solve This?

How do you investigate hypotheses?

Math

Misconceptions About the Universe
5:45
Misconceptions About the Universe

The expanding universe is a complicated place. During inflation the universe expanded faster than light, but that's something that actually happens all the time, it's happening right now. This doesn't violate Einstein's theory of relativity since nothing is moving through space faster than light, it's just that space itself is expanding such that far away objects are receding rapidly from each other. Common sense would dictate that objects moving away from us faster than light should be invisible, but they aren't. This is because light can travel from regions of space which are superluminal relative to us into regions that are subluminal. So our observable universe is bigger than our Hubble sphere - it's limited by the particle horizon, the distance light could travel to us since the beginning of time as we know it.

2014 • Astronomy

You might also like

Black Hole Swarms
11:31
Black Hole Swarms

It’s been conjectured that the center of the Milky Way is swarming with tens of thousands of black holes. And now we’ve actually seen them.

PBS Space Time • 2018 • Astronomy

Monster Black Holes
54:31
Monster Black Holes

There are Black Holes, and then there are Monster Black Holes -- containing several million to ten billion times the mass of our Sun! They've been discovered in the center of many galaxies. But they don't just absorb everything around them...in fact, they may be key to forming new galaxies.

10 • Cosmic Front • 2014 • Astronomy

Rosetta: Memories of a Comet
92:14
Rosetta: Memories of a Comet

Join the members of the historic Rosetta mission through the years as they launch, wait and then deploy the lander onto the comet 67P/Churyumov–Gerasimenko. Experience the dramatic highs and lows of the first mission to land a probe on a comet in space.

2017 • Astronomy

Jupiter
42:00
Jupiter

Beneath Jupiter's swirling clouds lie our solar system's deepest secrets: from its violent youth, through the birth of life to the death of the sun. Now, scientists are unlocking these secrets and discovering that every living thing exists thanks to Jupiter.

S3E3 • How the Universe Works • 2014 • Astronomy

Mystery Signal from Space
21:21
Mystery Signal from Space

Deep in the mountains of West Virginia, the Green Bank Observatory has been receiving a mysterious signal from deep space. Could this be a message from an advanced civilization, or is it a much stranger and violent occurrence? Visit the largest steerable radio telescope on the planet for answers.

2018 • Astronomy

Extreme Orbits - Clockwork and Creation
43:22
Extreme Orbits - Clockwork and Creation

Orbits are the dynamics that drive the universe. From the smallest asteroid to the largest super-cluster, everything in the universe is in orbit. We owe our very existence to the stability of earth's orbit — it gave us life and keeps us safe. But we are the freaks. Everywhere else we look we find orbits are chaotic, unstable, and violent. Beyond our solar system we find planets that are blow-torched, stars that eat each other, and black holes that destroy everything in their path. Yet on the very largest scale, orbits are also a creative force. clashing galaxies give birth to new stars and new worlds. on the galactic scale orbits even construct the fabric of the universe itself.

S2E5 • How the Universe Works • 2012 • Astronomy