Is time travel possible? — prediction worksheet
Name ______________________ Class ______________ Date __________
For each question: tick your prediction before you try the lab, and say why. Then run it and see.
A traveller moves at 0.99 of light speed. Their clock shows 1 year. In your frame, how much time passes for you?
- ☐ About 1 year
- ☐ About 7 years
- ☐ About 100 years
Why do you think so?
What happened when you tried it?
One twin flies to a star 4 light-years away at 0.8 of light speed, and back. The Earth twin ages 10 years. When they meet again, the traveller has aged…
- ☐ 10 years — motion is relative
- ☐ About 6 years
- ☐ 0 years
Why do you think so?
What happened when you tried it?
You fall through a large black hole's horizon. Can any rocket, however powerful, get you back out?
- ☐ Yes, with enough power
- ☐ No — inside, the centre is in your future
- ☐ Yes, but only a little way
Why do you think so?
What happened when you tried it?
In Gödel's spinning universe, could you travel into your own past without ever going faster than light?
- ☐ No — going back in time always needs faster-than-light travel
- ☐ Yes — far enough out, circling the universe brings you back to the moment you left
- ☐ Only by standing still
Why do you think so?
What happened when you tried it?