cosmological distances

What Are Cepheid Variables And Why Are They Important?

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What Are Cepheid Variables And Why Are They Important? Cepheids are extremely important to astronomers because their periodic changes in brightness can be used to figure out how far away they are. Because Cepheids are intrinsically bright stars, they can be seen far away, and astronomers can use them to determine the distance to very

What Are The Rungs Of The Distance Ladder?

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What Are The Rungs Of The Distance Ladder? In this paper, we determine the sizes of the first three rungs of the cosmological distance ladder, the radius of the Earth, the distance to the Moon, and the distance to the Sun. The first two distances can be obtained without a telescope. What is the final