Recent content by Algaib

If the universe is 13.7 billion years old, then how can the observable universe reach out 46 billion light years, given that nothing can travel faster than light? Is it to do with the expansion of space, which doesn't abide by relativity laws?

How much difference in gravity would there therefore be between the closest point on planet A to planet B, and the furtherst point on planet A from planet B. (Lets say the planets are the size of our sun, or more). If none that would be noticable, then how large must the planets be for you to...

What if you had a pulsar with much more mass than the sun, say enough to pull everything into it, how long would that process likely take? For Earth to fall in?

If our sun was replaced by a pulsar, would our solar system be sucked into it because of the increased gravity? How long would it take? Would we burn up because of the increased heat? How long would it take? Does it still emit visable light or only x-rays etc..? Would the light on Earth be...

Scenario: Let's say I lived on planet A (which was massive), which orbited planet B (which was also massive) so closely that upon looking up into the sky, planet B would fill most of what we would normaly see as being blue sky. Living on such a massive planet has some probolems; e.g being...