The heavier you are, the steeper the sides of the trampoline well. That is why really massive things in the universe – like the Sun or black holes – have stronger gravity than Earth. So why does gravity pull you down and not push you away? Imagine someone went under the trampoline and...
In General Relativity it is possible to use the Schwarzschild metric and apply it to a mass, (such as the earth), you get a simple metric using the terms for flat Minkowski space-time, this metric does not have gravity associated with it and has a time-only term that corresponds to ...
Space is an almost perfect vacuum, full of cosmic voids. And in short, gravity is to blame. But to really understand the vacuum of our universe, we have to take a moment to understand what a vacuum really is — and what it's not. So, what is a vacuum, and why isn't space a...
Why does gravity not present in space? Why can't we feel gravity? How does gravity works? What effect does mass have on inertia? Discuss the basic ideas of density of states. Why does gravity have pull but no push? Why it's not possible to travel at spee...
It is usually regarded that the space-time is curved by gravity, because it is determined by massless spin-2 fields called gravitons. In this Letter it is shown that one must also regard the fact that the gravity is the gauge field of the translation group....
A. Because the gravity is too strong and it breaks the "skin" in space. B. Because bugs can "walk on water" in space. C. Because the surface tension of water stays strong without gravity in space. D. Because the water film doesn't form in space. ...
But good news for those of us who fear our clumsiness would cause a literal trip into outer space: Gravity does exist in space! We're not saying that previous astronauts were fakingweightlessness. Rather they were experiencing microgravity, or gravity that's quite weak in comparison with what ...
It stands to reason that once in a while they need to have a good cry. But this is a lot harder than it sounds.We still know very little about space and about living in zero gravity. In fact we are discovering new things every time astronauts take to the skies (and beyond). As ...
二、单项选择。( B )1.-Why does the Earth look blue in space?-Because most of the Earth's s
But in a spacecraft this is not the case. Here there is no gravity which is why we so often see pictures of astronauts floating around. This means that strangely when you cry your tears have nowhere to go. As a result they just stick to your eyes....