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DerKrebs [107]
3 years ago
10

How was Edwin Hubble able to use his discovery of Cepheids in Andromeda to prove that the "spiral nebulae" were actually galaxie

s external to the Milky Way?
Physics
1 answer:
Ad libitum [116K]3 years ago
7 0

Answer:  The correct answer is :  From the period-luminosity relation for Cepheids, he was able to determine the distance to Andromeda and show that it was far outside the Milky Way Galaxy.

Explanation:  Hubble's law says that the recession velocity of a galaxy is directly proportional to its distance from us. Hubble measured the distance to the Andromeda galaxy by applying the period-luminosity relationship to Cepheid.

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Answer:

it shows that co2 is absorbed by the atmosphere.

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3 years ago
Electromagnets are created by
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Answer:

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Explanation:

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Consider the following statements about Newton's 2nd law in general. Select all of the statements that are true. Note, there may
Art [367]

Answer:

1. True

2. False

3. True

Explanation:

Newton's 2nd law states that the net force exerted on an object is equal to the product between the mass of the object and its acceleration:

\sum F = ma (1)

where

\sum F is the net force on the object

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Furthermore, we know that acceleration is defined as the rate of change of velocity:

a = \frac{dv}{dt}

So let's now analyize the three statements:

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2. If an object has a velocity, then we can conclude that there is a net force on the object: FALSE. The fact that the object has a velocity does not imply anything about its acceleration: in fact, if its velocity is constant, then its acceleration is zero, which would mean that the net force on the object is zero. So this statement is not necessarly true.

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8 0
3 years ago
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mezya [45]
Comets orbit the sun just like planets do. Except a comet usually has a very elongated orbit. Thanks to the laws of gravity comets obey the same laws. A comets orbit takes it very close to the sun and then far away again.
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2 years ago
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