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Post by Deleted on May 26, 2021 8:04:52 GMT
Of course, we do. Mass causes gravitiy. No, we have no clue what causes gravity. "Mass causes gravity" - why does mass cause gravity? Keep asking "why" until you get to a reason which is not just "because it does". That's what I mean by having no clue what causes it. Why does that matter to your question? We know dark matter exists because of gravity it causes. The celestial objects that it surrounds have to escape from it. There you go.
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Post by Flying Monkeys on May 30, 2021 12:13:16 GMT
No, we have no clue what causes gravity. "Mass causes gravity" - why does mass cause gravity? Keep asking "why" until you get to a reason which is not just "because it does". That's what I mean by having no clue what causes it. Why does that matter to your question? We know dark matter exists because of gravity it causes. The celestial objects that it surrounds have to escape from it. There you go. Finding out why gravity exists - why mass attracts itself - is the greatest challenge in science, in my view. If you can understand what causes it, you could come up with something to overcome it. Imagine inventing anti-gravity bricks that you can strap to an object so that gravity is cancelled. Want a space station? No need to burn a ton of fuel, just build it on Earth, strap some bricks to it and up it goes. Want a container sent across the ocean? Forget stupid fuel burning ships, just catapult it across and have a catcher at the destination. If you can understand why gravity exists, it would be the biggest game changer in science ever. It's the only thing I would have considered doing a PhD in.
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