Technically we are all time travelers. The only thing is, we can move in only one direction, and at a constant speed of 60 seconds per minute.

You'll get paid after we get back.
Must bring your own weapons.
Safety not guaranteed.
I have only done this once before.

if they had, we'd already know.

He's going to release all the details last week.

Signed, Dr. E.L. Brown

Mallett’s vision for a time machine centers on what he calls “an intense and continuous rotating beam of light” to manipulate gravity. His device would use a ring of lasers to mimic the spacetime-distorting effects of a black hole.

Ring laser time navigator

Can only go back to when you started operating the device. So, basically the Primer time machine, except the math says it has to be done at galactic black hole amounts of energy sort of scale.

@inkican Going back in time would require more energy than is available in the universe, for going faster than the speed of light, which is impossible. That's the basis in the theory (should be called 'law' by now) of relativity.
Backwards time travel would obviously interfere with causality in creating an alternative past, which would lead to a different present. So it's a good thing that it's physically impossible, despite what a desperate astrophysicist believes.