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A star that pulsates radially, changing both diameter and temperature is called a ...

Quasars

Magnetars

Pulsars

Cepheid

A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period established Cepheids as important indicators of cosmic benchmarks for scaling galactic and extragalactic distances.

Ts

4

Robert Sullivan wikipedia → Cepheid variable

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10

Which astronomical discovery was nicknamed 'Little Green Man'?

This is the aurora of Jupiter. What are the visible bright spots caused by?

atmospheric storms

multiple magnetic poles of Jupiter

This unique line of about 20 stars is known as ...

Kemble's cascade

The celestial sphere is divided into ...

22 constellations

44 constellations

66 constellations

88 constellations