Time travel is next to impossible due to the energy required, the linear nature of time, and the further forward or backwards you go the less precise your relative location calculation becomes.
Lets say that you want to go back in time to see the dinosaurs. So you strap into your time machine, fire up your flux capacitor, power up from your nuclear reactor and poof you pop out at the right time, but your floating in space with your head swelling, your lungs boiling, your eyes popping out of your head. Because the earth doesn't sit in the same space in the universe a billion years ago as it does now. You thought that you made the right calculation but you ended up on the moon because of quantum jitter.
Lets say by fluke you get back to the dinosaur days you get out and see a velocerapter staring at you, run back to your team machine, turn the key and feel the reassuring softness of your bunny foot keychain, you turn the key, clunk, crap no nuclear reactor.
24 hours later you emerge in pieces from several raptor rectum, nice planning Einstein.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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