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Sci-Five | The Hindu Science Quiz: on astronomical distances
The Moon is an average of 3,84,400 km away from Earth. File
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What is an astronomical unit?
- Distance between Sun and Earth
- Distance between Moon and Earth
- Difference between perigee and apogee
- Distance between Moon’s farthest and closest points from the Sun
An AU is roughly 150 million or 15 crore km
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2 / 5 |
Average distance between Moon and Earth is...
- 0.02 light minute
- 2 light minutes
- 1 light minute
- 4 light minutes
The Moon is an average of 3,84,400 km away from Earth, that is approximately 0.0214 light minute away
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3 / 5 |
Which is longer? Parsec or light year?
- Parsec
- Light year
- None. Parsec is latin for light year
- Depends on perigee and apogee
One parsec is 3.26 light years
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4 / 5 |
Who is the first to use light year to measure astronomical distances?
- Friedrich Wilhelm Bessel
- Jean-Dominique Cassini
- Eric Romer
- James Bradley
In 1838, the German astronomer Bessel measured the distance between Earth and binary star 61 Cygni as 10.3 light-years
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5 / 5 |
Astronomers use a phenomenon called redshift, marked by the parameter z, to indicate large distances. What distance does z=1 indicate?
- A bit over 10 billion light years
- Around 10 billion parsecs
- About 13 billion km
- About 13 billion AUs
A z value of 1 indicates that the distance from that object is 10.147 billion light years now. Redshift are useful to locate fast-moving galaxies of the ever-expanding universe
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