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Did you know . . .
September 5th, 2008 by whit3kr0w
. . . that the speed of sound is 343 m/s or 1235 km/h? Speeds higher than this are called supersonic and are usually referred by the unit Mach. Being Mach 2 two times the speed of sound (2470 km/h). Speeds after Mach 5 are usually called hypersonic speeds.
. . . that the speed of light is approximately 300,000 km/s (three hundred thousand kilometers per second)? To be more precise it is 299,792,458 m/s (meters per second).
. . . the distance from Earth to Sun is around 149,598,000 kilometers (almost 150 million kilometers)? To this distance we can call Astronomical Unit or AU.
. . . that with the above data we can say that light generated by the Sun will take roughly 500 seconds (8 minutes and 40 seconds) to reach us.
September 27th, 2008 at 19:53
It’s weird to think that we see the sun as it was 9 minutes ago.
September 29th, 2008 at 16:33
Yes, that’s true. It is quite strange indeed.
The farther we are from an object the more time has passed since it “emitted/reflected” the light we’re seeing.
From an object merely 3 meters away the light takes 0.00000001 seconds to reach our eyes. It’s fascinating.