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Watch beautiful science fiction videos, learn astrophysics and check your knowledge with quizzes!
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Cosmic microwave background

The cosmic microwave background is electromagnetic radiation as a remnant from an early stage of the universe, also known as “relic radiation” – faint cosmic background radiation filling all space and an important source of data on the early universe.

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Cosmic microwave background

1 / 5

What kind of spectrum does CMB have?

2 / 5

What is density of CMB photons?

3 / 5

What process did make the Universe transparent for photons?

4 / 5

When did recombination occure?

5 / 5

At what temperature did recombination occur?

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The average score is 100%

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Red dwarfs

The last star in the universe will be a red dwarf. Red dwarfs in general might be great places to look for aliens – or planets for humans to find a new home after our solar system has died.

CREDITS: courtesy of kurzgesagt.org
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Red dwarfs

1 / 5

How many stars in the Universe are red dwarfs?

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What mass a red dwarf does have?

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Why do red dwarfs have such a long lifespan?

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Why does a life may suffer on a planet near red dwarf?

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What red dwarf is the nearest to our Sun?

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The average score is 53%

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Black holes

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can’t see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars.

CREDITS: courtesy of kurzgesagt.org
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Black holes

1 / 6

What minimal mass a neutron star must have to become a black hole?

2 / 6

How small the Earth must be squished to become a black hole?

3 / 6

What happens if the sun is replaced with a black hole of the same mass?

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If photons have no mass, why they can’t escape from a black hole?

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What are the signs of a black hole?

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What is in the center of a black hole?

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The average score is 83%

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Neutron stars

Neutron stars are one of the most ambitious and dangerous objects in the universe. Huge atomic nuclei with a diameter of only a few kilometers but with a mass like stars. And the reason for their existence is the death of something magnificent.

CREDITS: courtesy of kurzgesagt.org
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Neutron stars

read more about neutron stars to pass the quiz!

1 / 9

What minimal mass a main sequence star must have to become a neutron star?

2 / 9

What is the final element in stellar nucleosynthesis before collapse?

3 / 9

Why iron is the final element in stellar nucleosynthesis?

4 / 9

Why does a supernova explode?

5 / 9

What is typical size of a neutron star?

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How hot is the surface of a neutron star?

7 / 9

What minimal mass a neutron star must have to become a black hole?

8 / 9

What core inside a neutron star is predicted by modern models?

9 / 9

Main method of detecting pulsars is:

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The average score is 89%

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White Dwarfs

Everything will end. Even the universe. But in a future so far away that it defies description, there will still be light and therefore a chance for life. It will be around White Dwarfs, the corpses of stars. But even they will fade one day

CREDITS: courtesy of kurzgesagt.org
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White Dwarfs

1 / 5

97% of stars become

2 / 5

What makes medium-sized stars stable?

3 / 5

What part of the star’s initial mass does the white dwarf have?

4 / 5

How close a planet has to be to a white dwarf to have liquid water? (compared to the distance to our sun)

5 / 5

How hot white dwarfs are compared to our sun?

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The average score is 93%

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Timelapse of the future: A journey to the end of the world

The video begins in 2019 and travels exponentially in time, watching the future of the Earth, the death of the Sun, the end of all stars, the decay of protons, zombie galaxies, possible future civilizations, exploding black holes, dark energy effects, alternative universes and the final fate of the space . Russian subtitles are available.

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Future of the Universe

1 / 6

What geological era do we live in?

2 / 6

Which star is a supernova candidate?

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What star will our sun become?

4 / 6

What is the future of the universe predicted by modern theories?

5 / 6

Why is the universe expanding?

6 / 6

How much energy of the universe is contained in empty space?

Your score is

The average score is 74%

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