Time Travel

15 Points Per Correct Answer - No time limit  

1. Time travel (traveling to the past or future) has been a popular theme in film and fiction. Albert Einstein offered a groundbreaking theory that gives some scientific possibility to actual time travel. What theory is this? Wave Particle Duality Theory Special Relativity Theory Time Travel Theory Big Bang Theory

2. Many scientists believe that time travel to the future could be achieved. What is one way in which a person could hypothetically travel to the future? Travel slower than the speed of light Travel faster than the speed of light Make use of very weak gravity None of these

3. There are various space phenomena, in theory, that astronomers could use to travel back and forth in time. Black holes are one option. Which of the following is true about black holes? A black hole's gravity does not bend light. The Sun is likely to become a black hole. There is no real evidence that black holes exist. No object can escape their gravitational pull.

4. Cosmic strings have been singled out by scientists as possible enablers of time travel. What is the problem with cosmic strings? Quantum mechanics do not allow for cosmic strings. They have no effect on time or space. They have not actually been found. They have a two-dimensional singularity.

5. Wormholes are the most popular "time machine" option for astrophysicists. True False

6. Traveling to the past poses more problems than traveling to the future. Many complex obstacles could arise in past time travel, leading physicists to believe that it is impossible. One of the major objections to the possibility of time travel is the "Grandfather Paradox". What does this paradox state? If you went back in time and killed your grandfather, then you could not exist, so you could not have killed your grandfather, etc. There is no "Grandfather Paradox". If you went back in time, you might meet your grandfather and learn secrets about your past. If you traveled to the past, you might run into yourself, but how can there be two of you?

7. The "Twins Paradox" is another example used by physicists to deny hypothetical time travel. True False

8. Other scientists claim that if past time travel were possible, people from the future would have visited us by now. Astronomer Carl Sagan refuted this logic with all of the following points EXCEPT: Perhaps time travelers just haven't reached our time yet. Time travelers are possibly among us, but have disguised themselves. Maybe past time travel is only possible up to the time that time travel was invented. Time travelers are likely exploring other planets.

9. What solution do time travel proponents offer to those who negate its possibility? Parallel universes Predestination Chronology protection Infinite loop of time

10. What is a major physical obstacle to the potential of time travel? We do not have a strong enough power source that we are able to control. We cannot create a gravitational field strong enough to make an enclosed, circular vacuum. All of these We are unable to accurately manipulate negative energy density.