Question

1.) In astronomy and astrophysics the concept of a standard candle is very important. What does this mean?

2.) From the introductory material, your work, and the following link explain why Cepheid variables are considered standard candles.

http://www.astro.ex.ac.uk/people/hatchell/rinr/candles.pdf.

3.) Consider the following link and use it to define the distance ladder. What are some difficulties in determining the distance to other stars and galaxies using a telescope? How reliable are Cepheid variables as a rung on the distance ladder? What are the limitations of using Cepheid variables in this fashion?

https://www.aavso.org/cosmic-distance-ladder.

Answer 1