Earth is a measly 93 million miles from the ... Most research today focuses on a travel time of around 15 years as a compromise between fuel costs and travel time. Any faster, and you have to ...

YR4 has a very small chance of striking Earth when its orbit briefly intersects our planet's in December 2032.

and another 1.3 seconds for the answer to get back to Earth. Those 2.6 seconds were exactly the round-trip travel time for radio waves between the Earth and the Moon. The Sun is 93 million miles ...

Google Earth now allows users to see the world as it was 80 years ago. With a new feature, users can 'time travel' to the ...