2 questions: 2 weird questions ?

"do you think there was time before the big bang?"

The problem with that question is the wording. Time, as we perceive it, seems to have begun with the beginning of the expansion (the moment that people mistakenly call the Big Bang). At the "Planck Time", a very tiny fraction of a second into the expansion, the universe was at the Planck Temperature. (You can look up Planck Units on wikipedia).

At that instant, every single point in the universe would have been a black hole, therefore the whole universe would have been an event horizon.

From our frame of reference, we do not know how time behaves on the other side of an event horizon.

Therefore, we do not know how to interpret the word "time" nor the word "before" in relation to that particular instant.

"do white holes exist..."

The modern answer seems to be no. Not only have we never observed anything that would even remotely be considered a hint of a white hole, but the mathematics that led to the idea are now considered relatively weak.

"... time travel" If you mean back and forth, no. There are devious ways to travel towards the future (we all do, unwillingly, but one could get oneself frozen -- once they work out the bugs -- and wake up in 500 years) but not towards the past.

"relativity"

The theory of relativity explains how things can be perceived in relation to each other. For example, in the theory that came before Einstein's (called Newtonian or Galilean relativity), things were straightforward: If you are on a train moving at 100 km/h and you are throwing a baseball towards the back of the train at a speed (relative to you) of 100 km/h, the ball will appear stopped (except for its fall downwards) for a spectator standing on the ground outside the train.

In the classical theory, gravity was instantaneous. Also, if you turned on a flashlight while moving very fast, the light coming out of the flashlight would go faster than if you were stopped.

All was fun, until radios came along. It was shown that radio waves and light were basically the same thing (photons) but at different frequencies. They both traveled at the same speed.

So, if you put a radio transmitter on an airplane and transmit while the plane is approaching the receiver on the ground, the radio signal should travel faster.

It did not. Regardless of the speed or direction of the airplane, the radio waves always traveled at the same speed.

So Einstein came up with a new theory of relativity where there was a speed limit (the speed of light in a vacuum). The behavior of "relativity" changed as things got close to the speed of light. For example, an outside observer looking at something moving very fast would note that time would seem to flow at a different rate on the fast moving object.

Relativity is the set of rules that allow to determine what these effects are.

"sun exploding"

Our Sun will not explode. It does not have enough mass for that. In about 5 thousand million years (5 billion if you use the short scale) it will bloat out and become a red giant.

By that time, Earth will already be uninhabitable (too hot) as the Sun will get hotter and hotter before the red giant phase. If we still exist, we will already have escaped billions of years before that.

Yes, you got carried away.

Whether time existed before the Big Bang is debated by cosmologists - there is no answer at this time.

White holes are the theoretical time reversal of a black hole (there is no evidence that white holes exist). If a white hole and black hole collided then its likely that they would mutually annihilate each other into a burst of energy.

Time travel is not possible, according to the laws of physics.

There is no law of relativity, there are only Einstein theories of relativity - too much information to type in here.

The sun won't explode (its not massive enough) - so no, humans won't see the sun explode. And since it won't explode there is no reason to escape.

Big Bang: I guess, other wise how would the bing bang have come into affect, its not like time starts after humans come into the universe....time has been there all along.

Black Holes:

White holes dont exist.....and even if a White Hole and Black hole were combined nothing would happen........the pull of gravity in a black hole is so strong it even pulls in light.....thats why it is called Black Hole, you cant see anything.....to see colour you need light..so even if a white and black hole combined it would still be black....black holes are formed from collided stars....and we dont actually know a lot about black holes...so even if there was a white hole....it would be hard......very hard to tell what would happen....either collide deeper..create a bigger hole with a massive gravitational pull or just create a massive explosion....or nothing....or something else.....who knows...

Combined Holes:

Nothing.....things called White Holes dont exists!!!

Time Travel:

Yes....humans have achieved a lot in small amount of time.....here take this for example......in 1800, we were still getting around in boats, we didnt have cars, phones, television, internet, anything........but just 200 years later.....look what we achieved.....we've gone to the moon, have planes, talk to people around the world,we know a lot about the earth and space....were coming up with all these sophisticated technology..... and i know you might be thinking 200 years is a lot.......but actually....its a very small amount of time compared to how long man has existed.....so yes, man will most likely achieve time travel.......maybe even in our lifetime....maybe it'll be us

Law of Relativity:

Dont know, something about time and light, and its not a law, its a theory....look in wikipedia.org

Sun Explosion:

That will be in millions of years.....the sun must form into a supernova before exploding....but supernovas are absolutely huge....so actually...it might engulf earth....and then explode later....so we wont be around to see the explosion....humans might not even be around then....seeing as how fast were running out of resources on earth....or we may how found another habitable planet and gone there.....who knows.... but most likely not.....actually....not sure...maybe!!!

Escape Sun Explosion:

There is no escape!!!!!!!

Ewww! I haven't a clue why a normal human being would do that, wait, scrap that, I haven't a clue why ANY human being would do that!!! Gross! But how to deal with it.... What I would do is tell your babysitter that you no longer need her help and fire her (In a nice way!!). Then keep checking (like every day) if the... urine appears again while she is fired and if it does then maybe there is mice in the storage room. If it doesn't continue then call her up again (maybe after a week or two) and ask her if she could babysit one more time. If the "liquid" appears again then... well... you have your culprit. Never let her in your house again. This is disgusting. I cannot believe someone would do this. Or another alternative is to get a video camera/nanny cam and to hide it the storage room pointing at the corner where the "liquid" appears.

Ya see, chap, there is this organization of individuals that hold extremely sacred knowledge. Knowledge of how everything works in this reality, but they keep it to themselves so you and people like you have to keep on asking questions with things like science, and on websites like yahooanswers.com. This group of people have gone under several different names throughout time, therefore they don't really have an ACTUAL name. This is why it is challenging to identify them, but one name you can give them, you ask?? The illuminated ones. And it's very appropriate, actually, because they are ILLUMINATED into sacred knowledge that everybody else is likes to guess at.

People like little "LindaJune" go around on the internet pretending like they understand everything that they talk about, which they do not. LindJune, among many others like her, are simply basing their opinions on the data of somebody else. The 'somebody else' that Linda and others get their data from is usually a scientist. And scientists use a process, pretty recently discovered, called science to analyze the physical(very occasionally the NON-physical) reality in which we are inside of right now.

But the most important point of all,and it's an extremely CRITICAL point although simultaneously very simple, is that the process of science is totally INCOMPLETE and has revisions constantly occurring to it's "laws", theories, views, and most importantly it's hard data as well.