Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Explain the Heat loss and Bacteriolytic action Heat loss - This is found in dog, sheep etc. Who do not have sweat glands? In very hot climate, they secrete more saliva (pant
Availability of Nutrients: The nutrients in the upper layers of water are constantly being taken up by the phytoplankton, who are the producers, and then these pass on to th
Mars- the Red Planet After Venus, Mars is our closest neighbour. It seems very earth-like. There are ice-caps on its poles, drifting white clouds and raging dust storms in
what are the measurable causes of weather and how does weather impact our world?
Determine in detail about the Phosphorus Phosphorus, with nitrogen and potassium is classed as a major nutrient element. It is a constituent of nucleic acids, phytin, phosphol
A cloud in a bottle You can make a cloud form in a bottle. Get a large glass bottle and fit with a rubber stopper carrying a 10-cm length of glass tubing. Place about 2.5 cm of
vanounmoolan
Explain Major Histocornpatability Complex (MHC) Major histocompatability complex is also known as the Human Leukocyte Antigen (HLA). MHC molecules are important components of t
What is an example of the elements of the systems
Ground depressions in areas of Karst topography are called: Sinkholes
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd