No, the universe is not a sphere. It existed before the big bang and it is infinite.
There is no surface, wall, boundary, et cetera to the universe. That is like asking where infinity starts and stops.
If it's a large asteroid, it could take hundreds of nukes (maybe even more) just to nudge it enough. I haven't seen anyone bring up the possibility of using lasers. I imagine that it would probably take a lot of time to do that though.
There wouldn't be enough mass to start fusion of the helium and should eventually cool. Over trillions of years it will cool to a point where is it no longer visible ( a black dwarf). That is all I can remember from my class.
It is somewhat of the opposite.
No. The magnetic fields of the sun tangle (largely due to the sun rotating faster at it's equator). Eventually the lines break and you have a polar reversal. If I remember correctly, the same happens on Earth but at a much slower rate...
If I'm not mistaken, I believe he means that when looking through the eye piece only a small amount of area is viewable. Not sure how to put it but when he should be able to see "O" he is only able to see "o" instead with the surrounding area being blacked out. So somewhere there is a misalignment.
For a race of beings capable of traveling light years, I'm certain they would have the technology to make them selves unknown to us (regardless of our attempts). I also question why they would want to visit or even observe an inferior race of beings. Michio Kaku said: “Imagine walking down a...
I mean more of a planet with multiple magnetic poles. I wonder how anything from single cell to just plant life would be affected (not by the radiation, but the magnetic fields themselves).
After reading about Jupiter's magnetic field on ScienceAlert, I remembered another article about tree bark and magnetic anomalies (links below). I also remembered an article on birds being able to see magnetic fields as well. It got me thinking of how and if life is possible on anything other...