Special & General Relativity Questions and Answers
What is the speed of light in megaparsecs per planck time?
Well...the speed of light is 2.997 x 10^10 centimeters per second; a megaparsec is 3.085 x 10^24 centimeters; and the Planck time unit is about 1.5 x 10^-43 seconds. The speed of light is, therefore, 9.7 x 10^-15 megaparsecs/second, or 6.5 x 10^28 megaparsecs/Planck time.
I am not even going to ask why anyone needs to know this!
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.