Q 01/05
A) Speed
B) Time
C) Length
D) Brightness
Answer · why
Despite the word year, it measures how far light travels in one Julian year of 365.25 days.
Q 02/05
A) 9.46 trillion
B) 94.6 trillion
C) 946 trillion
D) 9.46 quadrillion
Answer · why
That is about 5.88 trillion miles.
Q 03/05
A) NASA
B) The International Bureau of Weights and Measures
C) The International Astronomical Union
D) The Royal Society
Answer · why
The Julian year is used rather than the 365.2425-day Gregorian year or the tropical year.
Q 04/05
A) Billions of light-years
B) Trillions of light-years
C) Thousands of light-years
D) Millions of light-years
Answer · why
Galaxies themselves span a few thousand to a few hundred thousand light-years.
Q 05/05
A) ltyr
B) lgy
C) lyr
D) ly
Answer · why
French, Spanish and Italian use al, and German uses Lj for Lichtjahr.
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