Question 1

What is a solar radius?

Accepted Answer

The solar radius (R☉) is 695,700 km, the radius of the Sun. Used in astronomy to express star sizes. Betelgeuse is about 700 R☉.

Question 2

How big are other stars in solar radii?

Accepted Answer

Red dwarfs: 0.1-0.5 R☉. Sun-like stars: ~1 R☉. Red giants: 10-100 R☉. Supergiants: 100-1000+ R☉.

Question 3

Is this conversion factor exact?

Accepted Answer

Metric-to-metric conversions are exact (1 km = 1000 m). Imperial-to-metric factors like 1 inch = 2.54 cm are exact by international agreement.

Question 4

Why do some countries use different units?

Accepted Answer

Historical reasons - the metric system spread from France after 1795. The US, UK, and a few others retained older systems. Science uses metric worldwide.

Solar Radii to Kilometers Converter

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