Foolish notions.  You primitive Primates are full of them.  Dark Matter, Dark Energy, The Big Bang, The Time/Space Continuum....  all of this nonsense stems from the fact that you are simple, three dimensional creatures who are incapable of comprehending the multi dimensional universe in which you live.
    Let me try to help you.  First, there is no such thing as Dark Matter or Dark Energy.  These are just fudge factors that you throw into your equations because you're incapable of comprehending The Fourth Dimension.  There was no Big Bang and the universe is not expanding at an ever accelerating rate.  You think these things because of your skewed three dimensional perspective.
     You call yourselves Homo Sapiens (Wise Man) but on only seven percent of all timelines do you ever evolve into creatures capable of truly logical thought.  On all the rest you kill yourselves off.  Only one human from this era, Einstein, was ever able to think in logical terms and visualize the universe as it actually is, be it in a simple, primitive manner. 
     Speaking of timelines, let me clear up some of your misconceptions.  First, though traveling back in time is relatively simple (as evidenced by the fact that I'm here) it is quite impossible to travel forward in time.  There is no way I could explain to you why this is... it would be like attempting to teach Calculus to a Slug.  Just take my word for it.  When one does travel back in time there is no way he can "ruin" The Time/Space Continuum.  The timeline you just left continues on, undisturbed, no matter what you do to the past. Once you reach what ever past time you desire to occupy you start a new timeline.  Consequently, there are an infinite number of timelines.   In a sense each person is the master of his own universe in that he can go back and start a new timeline as often as he likes. 
     Hopefully this has cleared a few things up for you. Maybe.

actually time travel into the future is easier than to the past. Although you could conceivably send two objects of equal mass - one into the future and use the energy loss from that to add energy to the one sent to the past.

#gravityisfake

Well, obviously Rat Man. Infinity is the fallacious projection of n dimensions onto an n+m dimensional universe.

NooneOfConsequence wrote on Mar 15^th, 2019 at 11:02pm:

Well, obviously Rat Man. Infinity is the fallacious projection of n dimensions onto an n+m dimensional universe.

'Zactly