Help me please 1. If you observe two Cepheid variable stars to have different pe

ID: 233874 • Letter: H

Question

Help me please

1. If you observe two Cepheid variable stars to have different periods and the brighter one has a longer period, (B)

A. there is not enough information to determine which star is closer

B. the brighter one is farther away.

C. the brighter one is closer.

2. Which of the following statements is an explanation, not an observation?(D)

A. Stars shine with energy generated by nuclear fusion in their cores.

B. Stars can shine brightly for millions of years.

C. More distant galaxies are moving away from us faster than nearby galaxies.

D. All planets orbit the Sun in the same direction and in nearly the same plane.

1) C. the brighter one is closer.

Brightness and distance are inversely proportional (Brightness varies inversely with the square of the distance)

So brigher one will be at a closer distance.

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