The Time Machine

When the TT explains his ideas, his guest argue with him. Which of these reasons do they give to say that time travel is impossible?

1- We can't move in time like we can move in space.

2- You can't travel into the past because it might change history.

3- If something travels into the future, you can still see it, because it has to travel trought the present.

From chapter 1 to chapter 3.

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Last updated by Aslan
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My understanding is that the others argue that Time cannot be a Fourth Dimension because it cannot be altered, because we cannot change where we are in time. #3 seems the closest to that.