Take A Journey Into The Center Of The Galaxy – How Do You Find Exoplanets?

We live in the Milky Way Galaxy, which is a collection of stars, gas, dust, and a supermassive black hole at it’s very center. Our Galaxy is a spiral galaxy, which are rotating structures that are flat (disk-like) like a DVD when looked upon edge-on. There is also a bulge in the middle that consists of mostly old stars. When you look at a spiral galaxy face-on, you can see beautiful spiral arms where stars are being born. Our solar system is in the Orion arm, and we are about 25,000 light years (2.5 X 10^17 miles) from the very center of the Galaxy.

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What Is A Block Universe?

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How the Universe Works Formation and Evolution of Planets in Universe – Space Discovery Documentary

Our Milky Way Galaxy was once thought to comprise the entire known universe. Today our universe encompasses many billions of galaxies, and its history can be recounted back to its earliest moments.

Our universe began with an explosion of space itself – the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies. Galaxies collected into groups, clusters, and superclusters. Some stars died in supernova explosions, whose chemical remnants seeded new generations of stars and enabled the formation of rocky planets. On at least one such planet, life evolved to consciousness. And it wonders, “Where did I come from?”

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Two Times in History When We Were Certain It Was Aliens

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Hello and welcome! My name is Anton and in this video, we will talk about the two times in history when we believed we discovered aliens or extraterrestrial intelligence.
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What If You Lived Inside a Hologram?

What if the Universe is an illusion? What if your reality is not what it seems to be? What if you are you’re just a 2D projection stretched on the surface of a black hole? And what does a black hole have to do with all this? I know what you think. This isn’t real. How can we live in a hologram if everything around us is three-dimensional?

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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.

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What If a Black Hole Deleted the Universe?

They are massive, and extremely dense. They rip apart anything and everything that gets close to them. Their gravity is so strong that even light can’t escape. We can’t see black holes. But we know they have the destructive power to wipe everything out of existence.

Transcript and sources:
Opening shots from INTRA by the brilliant Thomas Vanz:

Watch more what-if scenarios:
Planet Earth:
The Cosmos:
Your Body:

Tweet us your what-if question to suggest an episode:

What If elsewhere:

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T-shirts and merch:

Feedback and inquiries:

What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.

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How to come up with an idea for Mission Space Lab

For those looking for ideas for Mission Space Lab, this video offers some tips on how to come up with experiments by taking into account the AstroPi sensors available as well as some practical constraints.

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How ESA’s Dark Energy Telescope Will Map The ‘Dark Universe’

ESA is building its first space telescope to investigate how dark energy and dark matter control our universe.
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The universe is filled with planets, meteors, black holes, and galaxies—each with their own set of mysteries. But one of the best concealed aspects of deep space exists in what scientists describe as “the dark universe.”

The dark universe is where dark energy and dark matter are hidden, interacting with the matter we can actually see.

And because we can’t see this dark side directly, scientists know very little about dark energy and dark matter. It has taken decades to attempt to understand the dark side, but ESA’s space telescope mission, named Euclid, might just give us some answers.

The Euclid mission could piece together the puzzle that surrounds dark energy and dark matter, essentially helping us understand how the universe works.

ESA’s Euclid space telescope will not only map the geometry of the dark universe and provide it’s cosmic history, Euclid will also observe and analyze the shape and redshift of thousands of millions of galaxies spanning back 10 billion years.

Ultimately, this will provide a large-scale 3D map that allows scientists to see how dark energy has played a significant role in the universe’s expansion.

Euclid will also be on the hunt for Baryonic Acoustic Oscillations or what ESA describes as “wiggle patterns” within galaxy clusters. These patterns provide a standard ruler method for measuring dark energy with the expansion rate of the universe.

Find out more about dark matter, dark energy, and the Euclid mission on this episode of Countdown to Launch.

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Euclid Mission: Science Goals

“Until about thirty years ago astronomers thought that the Universe was composed almost entirely of ordinary matter: protons, neutrons, electrons and atoms. In the intervening years the emerging picture of the composition of the Universe has changed dramatically.”

What is Dark Energy?

“In the early part of the 20th century Albert Einstein had invoked a ‘cosmological constant’, (usually symbolized by the Greek letter lambda, Λ). It was a vacuum energy of empty space, which kept the universe (predicted by his field equations of the General Theory of Relativity) static, rather than contracting or expanding. It provided a way of balancing the gravitational contraction caused by matter. Once the universe was observed to be expanding Einstein hastily removed his cosmological constant.”

Euclid Consortium: A space mission to map the Dark Universe

“Euclid is an ESA medium class astronomy and astrophysics space mission. Euclid was selected by ESA in October 2011 (see the Euclid ESA page). Its launch is planned for 2022. In June 2012 ESA officially selected the “Euclid Consortium” as the single team having the scientific responsibility of the mission, the data production and of the scientific instruments.”


Countdown to Launch takes a deep dive into upcoming space missions from around the world. We interview the people involved and explore the science, innovation and technology that makes them possible.

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