How was Edwin Hubble able to use his discovery of a Cepheid in Andromeda to prove that a spiral nebulae were actually individual galaxies?

Md Ariful Islam

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After studying a Cepheid in the Andromeda galaxy, Hubble determined the distance and found out that it is not part of the Milky Way but another galaxy. The distance was too large for it to be part of the Milky Way.

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What distance method did Edwin Hubble use to determine the distance to local galaxies?




Let us blow a balloon, a little first, and mark few dots on this and then again continue blowing it, say at a uniform speed. One will see that dots...

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How do us humans know that there are millions of other galaxies? If galaxies are millions of years apart, how do scientists know that there are billions of other galaxies and that andromeda is the closest?

There are a ton of extremely powerful telescopes both here on Earth and in space that is capable of looking billions of light years far. And we can see a...

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If the Hubble Space Telescope proved that Hubble's constant is actually half as large as it is currently believed to be, what would the implied age of the universe be in comparison to the current accepted value?

The dimension of Hubble constant, $[H_o]-LL^(-1)T^(-1)=T^(-1)$. The dimension of thr reciprocal $[1/H_o]=T$ As of now, different estimates of $H_o$ have a range around 70 km/s/mega parsec. The reciprocal, after unit...

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Edwin Hubble discovered the universe was expanding by measuring the light of distant stars, and by showing that those distant stars were moving further away from the earth. If this is so, then why is the Andromeda Galaxy moving closer to us?

Andromeda is being pulled apart by the expanding universe. But the gravity between the Milky Way and Andromeda is strong enough to overcome this expansive force. Gravity is pretty...

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A cepheid variable in a nearby galaxy looks "10^6" times fainter than an identical Cepheid in the Milky Way? The Cepheid in the Milky Way is 1000 parsecs away. How far away is the nearby galaxy?

The absolute brightness (i.e. number of photons per unit time for a fixed size detector) decreases as the square of the distance. To prove this for yourself, think of the...

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The Hubble telescope captured galaxies in the eastern direction of the universe. Images came back proving that galaxies are made up of different colors. What would explain the reason for the make of colors in galaxies?

Galaxies early on in their lives are actively forming hot, new stars and appear more bluish. Older galaxies are forming fewer new stars and their constituent stars are older on...

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How did Edwin Hubble change the world?

Before Edwin Hubble came up with his theory that the Universe is expanding (supported by the red-shift of galaxies), the steady state theory was in vogue, stating that the Universe...

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What did Edwin Hubble discover? How did his work make a difference to how we understand the universe?

Hubble discovered that the Universe is expanding. Prior to his discovery, it was assumed that the Universe had always been here and never changed. But with the discovery of the...

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Why are spiral galaxies the most commonly observed galaxies?

The exact mechanism for the formation of the spiral arms continues to puzzle scientists. Scientists think they could be a result of density waves traveling through the outer disk....

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How are galaxies star clusters and nebulae different?

A nebula is a cloud of gas and dust, mainly hydrogen. They can be formed by gravitational collapse of interstellar medium which is mainly hydrogen and helium. A nebula can...

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