No paradox is unsolvable. Except the old "This statement is false." That's a one dimensional self-contradiction. Classic.
Crayzor said:
I go back in time and murder my grandfather. Because he doesn't exist I am never born, so I can't go back in time to kill him, which means he will survive and I will be born. And repeat.
You fool! You already killed him how can he survive? All you've done is altered the past by replacing your grandfather with a future version of yourself, who still exists in that altered timeline. What you've essentially done is created a divergent universe.
So now there are two timelines: One where your grandfather is born and you are eventually born, and you gain access to a time machine, then disappear. And another timeline where you spontaneously appear sometime before your father was born and you murder the man who would have otherwise become your grandfather. There's no paradox. (Beyond the violation of the first law of thermodynamics. Destroying matter in one universe and creating it in another, tsk tsk.)
sms_117b said:
The universe in infinite, and there are countless stars in the sky.
This means that at every point in the sky relative to earth, whatever it's position, there is bound to be a star emitting light.
So how come we have night?
1. Light bends with gravitational force. Just because a star exists doesn't mean its light will reach us.
2. Skyglow. The bright stars obscure the dim stars. Same reason we can't see them during the day.
3. Obstacles: Planets, nebulas, black holes, CLOUDS!
No need to bring up an expanding universe just yet...
reg42 said:
Can the almighty God create a rock which he cannot lift?
God's will is what determines reality. If he wanted it to be unliftable, it would be. If he wanted to be able to lift it, he could. God controls the very nature of the universe, a rock once unliftable doesn't have to remain unliftable.
So the short answer is yes.