Question 1

What is redshift in velocity?

Accepted Answer

Redshift shows how fast objects recede. z = 0.1 means 10% light speed. Distant galaxies show z > 1 (relativistic).

Question 2

How do astronomers use redshift?

Accepted Answer

Higher redshift = faster recession = farther away. Hubble's law: velocity ≈ 70 km/s per megaparsec of distance.

Question 3

What's the fastest speed possible?

Accepted Answer

The speed of light (299,792,458 m/s or about 670 million mph) is the universal speed limit. Nothing with mass can reach it.

Question 4

Why do pilots and sailors use knots?

Accepted Answer

One knot = one nautical mile per hour. Nautical miles relate directly to Earth's latitude (1 nm = 1 minute of latitude), simplifying navigation.

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