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Time Travel

Across
The normal passage or flow of time and its historical developments, within a given dimension of reality
A machine capable of transporting a person backward or forward in time
Based on theory rather than experience or practice
Time regarded as still to come
The body of scientific laws that describe the wacky behavior of photons, electrons and the other particles that make up the universe
An infinite realm of being or potential being of which the universe is regarded as a part
A paradox of time travel in which inconsistencies emerge through changing the past
A time machine and spacecraft that is larger inside than it appears to be outside
A British SciFi TV show about the adventures of a Time Lord called The Doctor
The process that allows your body to maintain its core internal temperature
Down
A four-dimensional reference frame, consisting of three dimensions in space and one dimension in time
Physical substance that has mass and takes up space
Happening at the same time
The action of driving or pushing forward
Between dimensions
A paradox of time travel that occurs when a future event is the cause of a past event, which in turn is the cause of the future event
Gone by in time and no longer existing
The branch of science concerned with the nature and properties of matter and energy
A region of space having a gravitational field so intense that no matter or radiation can escape
A novel series about a WWII-era nurse who travels through time to 18th century Scotland
The period of time occurring now