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Speed of light is 299,792,458 metres per second

There are 31,356,000 seconds in a year of 365 days ie not a leap year.

A light year is therefore 9,454,254,955,488,000 metres

Mach 1 is not constant as it depends on atmospheric composition and temperature but for this calculation I am using 340.29 metres per second.

At Mach1 it would take 27,782,935,012,748 seconds to travel 1 light year.

In more manageable terms this is 880,991 years.

I hope this helps - it made my brain ache !!!

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15y ago

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