Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)
…the door?
Maybe it’s a Tesla Time Machine.
Exploring time travel reveals that backward travel to any point before a machine is constructed is theoretically prohibited, whether framed by the universe’s need to avoid paradoxes (such as Stephen Hawking’s Chronology Protection Conjecture) or by simple physical geometry (like the Earth’s movement through the galaxy)
The door opens without electricity?
You are way over thinking this. It’s a webcomic with no details about how the time machine operates. The door has a handle. It open manually.