Theoretically, if Santa Claus delivered one parcel to every household globally, using current conventional methods of transportation, how long would it take him?

My Physics teacher says time started at the Big Bang. If time is the order of the sequence of events, surely there must have been time before the Big Bang in which the two antimatters collided to create it. Am I right?

One planet's year is defined by how long it takes the planet to complete one orbit around the Sun. So based on the distance from the Sun, one year on Earth is (of course) not the same as one year on Mercury (88 'Earth days') or Neptune (165 'Earth years').

But what if we theoretical were to move to the Sun? What would define one year on a star?

Anders, Norway

My Granson and I were talking about the Universe- how old it was and how long could  last. Then he said how long is now? I didn't have an answer- does anyone else?

Since Windows 3.0, the system has included at least one version of Patience (Solitaire). Can  anyone speculate as to:

• The number of man hours lost world wide to playing the game, as opposed to actually doing useful work.

• What could have been achieved if all the above lost time were used constructively to achieve a single goal, e.g. eradicating world hunger etc.

From NewScientist.com-

"This is a tale of two spacecraft. Pioneer 10 was launched in 1972; Pioneer 11 a year later. By now both craft should be drifting off into deep space with no one watching. However, their trajectories have proved far too fascinating to ignore.

That's because something has been pulling - or pushing - on them, causing them to speed up. The resulting acceleration is tiny, less than a nanometre per second per second. That's equivalent to just one ten-billionth of the gravity at Earth's surface, but it is enough to have shifted Pioneer 10 some 400,000 kilometres off track. NASA lost touch with Pioneer 11 in 1995, but up to that point it was experiencing exactly the same deviation as its sister probe. So what is causing it?"

Other things I have read about time have led me to wonder if maybe the craft aren't moving faster, but rather our perception of time is changing.

Another user on this site asked if time travel might be possible by further expanding or re-collapsing the universe to speed up or "rewind" time. I don't think traveling back in history could be done using this method, but it may be like flooring the gas or pushing the brake on time itself. He also pointed out that what we perceive as "time" is a dimension probably restricted to this universe, but because of that it may be pushing against the limits of its ever-expanding confines. If he's correct, then might time be "stretching" to fill the universe, thereby "stretching" our perception of it?

Just an idea to toss around.