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
10%
17%
46%
25%
58
flagPoland
14%
8%
54%
22%
1655
flagIndia
21%
17%
40%
20%
79
flagPakistan
10%
10%
60%
20%
10
flagthe Philippines
27%
9%
45%
18%
11
flagGermany
24%
20%
37%
15%
45
flagthe United Kingdom
11%
17%
55%
14%
34
flagAustria
28%
14%
50%
7%
14