Expanding universe, Science

Assignment Help:

The Expanding Universe:

Hubble's observations had proved  the existence of  galaxies. After mapping as many galaxies as could be seen by  the telescopes then'available, he turned his attention to the motion of  galaxies. He was motivated to do this by a puzzling report of  V.M.  Slipher, an American astronomer.  He  had  discovered  in 1912 that many of  the faint nebulae were moving away from the Earth at very great speeds. Their spectral lines exhibited large shifts towards the red end (what is called as red shift). This seemed peculiar because stars in  the Milky Way Galaxy move at much smaller speeds, some moving away from us with others moving towards us. Slipher had made these observations a decade before galaxies were discovered. Then it was thought that the nebulae were objects in our own galaxy. He did not know what  to make of  his observations. But as Hubble knew that these nebulae were galaxies, he began a systematic study of the relation between their speeds and their distances alongwith his colleague M.L. Humason. What they found was very interesting. To put  it  simply, his observations showed that; i)  all galaxies were moving away from us; ii)  the farther away a galaxy was from our Galaxy, the greater was the speed at which it moved away. Hubble's discovery put forth the picture of  an expanding universe. But if  all the galaxies are moving away from us, are we at the centre of  the Universe? No.  If  we were situated in another galaxy, even then the other galaxies would seem to move away from us. You can understand this picture of  an expanding universe if  you study Fig and also perform a simple activity. 

488_Expanding Universe.png


Related Discussions:- Expanding universe

Factors which decide the br, factors which decide the broad area of Scienti...

factors which decide the broad area of Scientific activity

Define transport of carbon dioxide combination with protein, Define the Tra...

Define the Transport of Carbon Dioxide in combination with protein Carbon dioxide forms a neutral carbamino compound with haemoglobin. It combines with the haemoglobin in the r

Explain the digestion of food, Explain the Digestion of Food Salivary a...

Explain the Digestion of Food Salivary amylase or ptyalin acts on cooked starches (polysaccharides) and changes them into maltose as shown herewith. Boiled starch → soluble

What are the effects of soil aeration, Effects of Soil Aeration Some s...

Effects of Soil Aeration Some soil pores are full of O 2 and/or CO 2 gas.  These gases take part in the respiration of plants. We know that respiration involves the oxidatio

Define procedure for estimation of iron in the solution, Define Procedure f...

Define Procedure for Estimation of Iron in the Solution? Carry out the experiment following the steps enumerated herewith: 1. Weigh 702 mg of reagent grade ferrous ammonium

Biology, explain the process of respiration in human beings

explain the process of respiration in human beings

Explain immune system, Explain Immune System The animals and the human ...

Explain Immune System The animals and the human beings are forced to encounter many dangerous microbe in their day-to-day life, through water, air and food. Inside our body the

State the role of algae - weathering, State the Role of Algae - Weathering ...

State the Role of Algae - Weathering Algae also plays an important role because it brings about increase in organic matter due to photosynthesis. The organic matter and CO2  fo

Some features of the forests, Some Features of  the Forests: Forests...

Some Features of  the Forests: Forests are the most widespread  stretches of vegetation, harbouring diverse kinds of life forms. They are dominated by trees. Besides trees, f

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd