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UNO [17]
2 years ago
10

Consider the following hypothetical observations, some of which are real and some of which are fictional. For each observation,

your job is to answer this question: If the observation were real, would it provide evidence for or against the idea that the universe is expanding? Sort each observation into the appropriate bin as follows:
A) Place an observation in the "Supports the expanding universe" bin if it would provide evidence that the universe is expanding.
B) Place an observation in the "Contradicts the expanding universe" bin if it would provide evidence that would force us to reconsider the idea of an expanding universe.
C) Place an observation in the "Neither supports nor contradicts" bin if it does not allow us to distinguish between a universe that is expanding and a universe that is not expanding.
Geography
1 answer:
Zolol [24]2 years ago
4 0

Answer:

A) Irregular galaxies outside the Local Group are moving towards us.

B) All galaxies in the Coma Cluster of galaxies have redshifted spectra

C) Galaxy speeds are faster in Summer than in Winter

D) The Andromeda Galaxy, a member of our Local Group, is moving towards us

E) The measured rate of expansion is the same in all directions

F) Galaxies 200 million light-years away move away from us twice as fast as galaxies 100 million light-years away

G) Spiral Galaxies move away from us 10% faster than elliptical galaxies at the same distances

Explanation:

The universe is expanding and has been continuously expanding since its formation billions of years ago. Because the universe does not have a center, everything is moving away from everything else through space.

Some of the statements in this question prove this while others contradict the observation of our universe expanding.

However, the Andromeda galaxy moving towards us neither supports nor contradicts this observation. The Andromeda galaxy is in our local group, a group bound together by gravitational force.

Supports the expanding universe

B) All galaxies in the Coma Cluster of galaxies have reshifted spectra

E) The measured rate of expansion is the same in all directions

F) Galaxies 200 million light-years away move away from us twice as fast as galaxies 100 million light-years away

Contradicts the expanding universe

A) Irregular galaxies outside the Local Group are moving towards us.

C) Galaxy speeds are faster in Summer than in Winter

G) Spiral Galaxies move away from us 10% faster than elliptical galaxies at the same distances

Neither supports nor contradicts

D) The Andromeda Galaxy, a member of our Local Group, is moving towards us

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D. Seafloor bedrock is younger near the ridge and older farther away.

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The plates in the oceanic crust moves apart due to the up welling of aesthenosphere materials . These aesthenosphere materials(molten magma) are introduce to the ocean floor through the mid oceanic ridge . As this materials are introduced through cracks and fissures, the plates continue to drift apart. The molten magma later solidified to form a new crust closer to the oceanic ridge.  This is why sea floor bedrock closer to the ridge is younger as new rocks are formed here. But as one move farther away from the ridge the rocks become older. This phenomenon provide ample evidence that the seafloor is spreading. The older rocks found father away from the ridge proves the seafloor has been spreading given way for new rocks closer to the ridge.  

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Explanation:

There is a difference between longitudes and lines of longitudes.

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  2. Lines of longitudes: These are imaginary lines that run around the Earth vertically (up and down) and meet at the North and South Poles. These lines are also termed as meridians. The Prime Meridian is located at 0° and the lines of longitude run east and west of Prime Meridian. There are 360 longitudes in total (180 east and 180 west of Prime Meridian). Further, all longitudes are also great circles.  

Learn more:

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