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We can determine the present rate of expansion by measuring the velocities at which other galaxies are moving away from us, using the Doppler effect. This can be done very accurately. However, the distances to the galaxies are not very well known because we can only measure them indirectly.
— A Brief History of Time
 (book)
by Stephen Hawking
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| Language: | English |
| Submitted by: | spondulix |
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