# If Uranus is 1,607,000,000 miles from earth how long would it take to get there?

Nov 29, 2015

At least $2.4$ hours (as perceived by an external observer)

#### Explanation:

The speed of light (in a vacuum) is exactly $299792458$ metres per second (by definition)

There are exactly $1609.344$ metres in each mile.

So the fastest possible time to travel from the Earth to Uranus is:

$\frac{1607000000 \cdot 1609.344}{299792458} \approx 8627$ seconds

or about $2.4$ hours.

If you were travelling at near the speed of light, then the time you would experience would be less than $2.4$ hours due to relativistic effects.