Let's revisit some number sense:
We know that light travels at the approximate speed of 300,000 kilometers per second.
There are 60 seconds in a minute:
300,000 x 60 = 18,000,000km in a minute
There are 60 minutes in an hour:
18,000,000 x 60 = 1,080,000,000km in an hour
There are 24 hours in a day:
1,080,000,000 x 24 = 25,920,000,000km in a day
There are 365 days in a year:
25,920,000,000km x 365 = 9,460,800,000,000km in a year
That number times 600 years:
9,460,800,000,000 x 600 = 5,676,480,000,000,000km
Basically, Kepler-22b is 5,676,480,000,000km away from Earth -- meaning that travelling at the speed of light, at 300,000km per SECOND, it would take you 600 years to traverse 5,676,480,000,000km across space!
Doesn't sound THAT far? To put that into perspective, consider this: a beam of light travels 7.5 times around Earth in just 1 second!
