Travel "light"
You decide to travel through space to a planet 5 light years away from earth at a certain point of time. You carry a Telescope with you on board the spaceship.
The ship only travels with the speed of light, which is also the initial velocity.You reach the planet after 5 years and then point the telescope towards the earth in a way such that the 2 positions on the planet and earth are connected by a straight line.
What will you see through the telescope?
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1 solution
You will see yourself leaving the earth because, it takes 5 years to reach the planet by light speed. The moment you reach to the planet the earth has already aged 5 years (Present earth time).
But, the photons from the earth require 5 years too to reach the planet. Hence, you see 5 years into the past of the "present earth time". Which is when you started your journey.
P.S: If you think there is a better/or even a different one, please do post!