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.
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Answers by country

Quasars
Magnetars
Pulsars
Cepheid
answers
flagAustralia
28%
14%
23%
33%
21
flagthe United States
11%
15%
50%
23%
52
flagPoland
14%
8%
54%
21%
1612
flagIndia
22%
18%
38%
20%
72
flagPakistan
10%
10%
60%
20%
10
flagthe Philippines
30%
0%
50%
20%
10
flagGermany
23%
18%
42%
15%
38
flagthe United Kingdom
11%
17%
55%
14%
34
flagAustria
28%
14%
50%
7%
14