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The observable universe is a big place that has been around for more than 13 billion years. Up to two trillion galaxies made up of something like 20,000 billion billion stars surround our home galaxy. In the milky way alone scientists assume there are some 40 billion earth like planets in the habitable zone of their stars. When we look at these numbers it is hard to imagine that there is nobody else out there.

Sources & further reading: https://sites.google.com/view/sourceskardashevscale/

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How did everything get started?

Has the universe a beginning or was it here since forever? Well, evidence suggests that there was indeed a starting point to this universe we are part of right now. But how can this be? How can something come from nothing? And what about time? We don't have all the answers yet so let's talk about what we know.

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Nothing in the Universe is static. In the milky way, billions of stars orbit the galactic center.

Some, like our sun, are pretty consistent, keeping a distance of around 30,000 light years from the galactic center, completing an orbit every 230 million years.

This dance is not an orderly ballet - more like a skating rink filled with drunk toddlers. This chaos makes the galaxy dangerous. Our solar neighbourhood is constantly changing, with stars moving hundreds of kilometers every second.

Only the vast distances between objects protect us from the dangers out there. But we might get unlucky in the future. At some point we could encounter a star going supernova. Or a massive object passing by and showering earth with asteroids.

If something like this were to happen we would likely know thousands, if not millions of years in advance. But we still couldn’t do much about it.

Unless… we move our whole solar system out of the way.

Sources & further reading: https://sites.google.com/view/sources-stellar-engines

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Why should you care about the well-being of people half a globe away?

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Is there a border we will never cross? Are there places we will never reach, no matter how hard we try? It turns out, there are. Even with sci-fi technology, we are trapped in a limited pocket of the Universe and the finite stuff within it. How much universe is there for us and how far can we go?

Sources & further reading: https://sites.google.com/view/sources-truelimitsofhumanity/

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Do we need nuclear energy to stop climate change? More and more voices from science, environmental activists and the press have been saying so in recent years – but this comes as a shock to those who are fighting against nuclear energy and the problems that come with it. So who is right? Well - it is complicated.

Sources & further reading: https://sites.google.com/view/sourcesclimatenuclear/

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What would happen if we were to detonate a very very powerful nuclear weapon on the moon? Would the explosion knock its orbit towards earth, causing tidal waves and misery? Could the moon be destroyed, showering the earth in a rain of meteoric death?

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Kurzgesagt is lying to you, in every video, even in this one. Because our videos distill very complex subjects into flashy ten minute videos and unfortunately, reality is, well, complicated. The question of how we deal with that, is central to what we do on this channel and something we think about a lot.

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Are GMOs bad for your health? Or is this fear unfounded?

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Modern life would be impossible without plastic – but we have long since lost control over our invention. Why has plastic turned into a problem and what do we know about its dangers?

Sources & further reading: https://sites.google.com/view/sourcesplasticpollution/startseite

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