Comments by "Delibro" (@Delibro) on "Professor Dave Explains" channel.

  1. No one said infinite gravity.
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  2. To hear an American talk about a person (Kepler) born only 20 minutes drive from my home is strangely satisfying :D
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  3. No, Black Holes evaporate until nothing is left. Really until the last atom.
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  4. It is.
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  5. I thought the same, but I ended watching the video :D You wrote the name wrong and you pronounced it wrong. Yea, thats the way his name is pronounced written in English: "Shvartz-shilled".
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  6. If you count Pluto as Planet, then why not Eris with nearly 3000 km diameter, Orcus with 1700 km, Sedna with also 1700 km, Quaoar with 1250 km, Haumea with 1500 km, Makemake with 1200 km, Gonggong, Sedna ... ...
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  7. No no no, a Dyson sphere would have about the same distance from the sun like the earth, so no problem with heat.
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  8. Why writing Dutch on an English video on an English channel? I also don't write German.
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  9. All the four gas giants have. But all are very dimm, besides Saturns.
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  10. The words of people in 1500 about the new continent :)
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  11. Venus shows us, how independent from the distance/brightness of it's star temperatures can be. So I always questioned the "habitable zone", it means nothing. In addition to that, most planets have large temperature gradients, on earth for example there are large regions with regularly 40 °C (100 °F) and large regions with -40 °C (-40 °F), so if earth would sit beyond the habitable zone (inwards our outwards), those regions would be the thriving parts on our planet instead. And there are so many other possible features that influence temperature, for example terrain height. Earth has large regions with about 1000 m (3300 ft) elevation and large regions with about -5000 m (-16 000 ft) (ocean floors), that alone leads to temperature differences of roughly 60 °C (140 °F)! Floating high in a thick atmosphere adds many thousand metres to that range. Then life could also develop 5000 m (16 000 ft) below ground (there can be water too), with temperatures being 100-200 °C (200-400 °F) higher than on the surface.
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  12. I don't think so. First it's not clear if the tilt would vary much without moon, but given that, life could adapt and even use the extreme seasons to it's advantage or maybe need the seasonless millions of years to even be able to get started.
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  13. I liked that too. It was the first time I heard someone say something like that. But there are so many possibilities, even on 500 °C Venus, there are places in the upper atmosphere that have moderate temperatures, or on a cold planet there might be kilometer deep cracks or valleys that have better temperatures, or on slow/not rotating planets you have the full variety of year long night and day temperatures. But all people constantly say, life must be in the habitable zone ...
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  14. Even four years later, James M haven answered. As always by these folks. They think they are smart, but can't even answer the first question anyone asks.
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  15. There are life forms on earth that can live in temperatures up to 70 °C, others in mostly frozen environments, earths atmosphere changed from mainly CO² and Nitrogen to todays 21 % Oxygen and Nitrogen, while even peaking at 35 % Oxygen, all while life thrived. Why some people think life needs the narrow perfect conditions?
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  16.  @ChrisNN-76  So, hydrogen has a speed of sound of 4600 km/h, so it's no problem with the 2200 km/h wind speed :)
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