INTERESTING Q AND A

-
Here are some of the amazing facts and figures related to the UNIVERSE. 



Is Speed Of Light Fixed?

The fact that light travels at a finite, but very high, speed was first discovered in 1676 by the Danish astronomer Ole Christensen Roemer. 
Maxwell's theory predicted that radio or light waves should travel at a certain fixed speed. But Newton's theory had got rid of the idea of absolute rest, so if flight was supposed to travel at a fixed speed one would have to say what that fixed speed was to be measured relative to.

The best-known equation showing equivalence of mass and energy, was summed up as Einstein's famous equation E= mc^2, states that nothing can travel faster than speed of light. Because of the equivalance of energy and mass, the energy which an object has due to its motion will add to its mass. In other words, it will make it harder to increase its speed. As an object approaches the speed of light, its mass rises ever more quickly, so it takes more and more energy to speed it up further. It can infact never reach the speed of light, because by then its mass would have become infinite, and by the equivalence of mass and energy it would have taken infinite amount of energy to get it there.
For this reason, any normal object is forever confined by relativity to move at speeds slower than the speed of light. Only light, or other waves that have no intrinsic mass, can move at a speed of light.

What Would Happen If Sun Disappears Suddenly?

Newton thought that gravity was a force that acts instantaneously across any distance and so we will immediately feel the effect of Sun's Destruction and Planets will immediately fly-off tangentially to their orbit. 


Einstein saw a big problem with Newton theory. A problem that arose from his work with light. Light from sun doesn't reach the earth instantaneously. In fact, it takes about 8 minutes for the Sun's rays to reach 149.6 million km (93 million miles) to the Earth. And since he had shown that nothing can travel faster than light. NOT EVEN GRAVITY!! So, how could the Earth be released from its orbit before the darkness resulting from Sun's disappearance reached our eyes. According to his theory- " If Sun disappears suddenly, the resulting gravitational disturbance form a wave that travel across the spacial fabric in much the same way the pebble dropped into pond makes ripples that travel across the surface of the water. So, we would not feel the change in our orbit around Sun until this wave reached the Earth." 

How Do Astronaumers Use Maths in Their Job?

Astronomer use maths all the time. One way it is used is when we look at objects in the sky with a telescope. The camera that is attached to the telescope basically records a series of numbers – those numbers might correspond to how much light different objects in the sky are emmiting, what type of light, etc. In order to able to understand the information that these numbers contain, we need to use  maths and statistics to interpret them. 

Another way that astronomers use maths is when they are forming and testing theories for the physical laws that govern and objects in the sky. Theories of cyst of formulas that relate quantities to each other (a very simple example is Newton's law, force = mass times acceleration). In order to be able to test these theories and use them to make predictions about what we will observe in the sky, astronomers need to use maths to manipulate the equations.

Why Pluto Is Not A Planet?

In early times Pluto was considered as the nineth Planet of our Solar System. But in the 26th General Assembly of International Astronaumical Union (IAU) in 2006 Pluto was declared as a Dwarf Planet. 



On 18 February 1930, American Astronomer Clyde Tombaugh discovered the nineth planet Pluto. While all the Planets orbit Sun in almost a round shape, Pluto's orbit was extremely elliptical and it takes 248 Earth years to complete its one revolution. At first it was believed that Pluto's mass was approximately equal to that of Earth's but later when its moon Charon was discovered then we came to know that Pluto is very smaller than Earth and has only 0.02% of Earth's mass.

But Discovery of one more Dwarf Planet Eris forces the IAU to change the definitions of a Planet. An object is considered as a Planet if it fulfills the three following check boxes.

1. The object must be orbiting the Sun.

2. It should have sufficient mass to assume Hydrostatic Equilibrium (a round shape).

3. It should "clear the neighborhood" around its orbit meaning that all the Asteroids around it should orbit it or collide into it.

This third criteria was new in the definition and this was the only one criteria which is not followed by Pluto. This is the main reason why Pluto is not considered as a Planet.




 

Comments

Post a Comment

Popular posts

LIFE CYCLE OF A STAR!

-
Image
Outlined below are the many steps involved in a stars evolution, from its formation in nebula, to its death as a white dwarf or neutron star. NEBULA A Nebula is a cloud of gas(hydrogen) and dust in space. Nebulae are the birth places of stars. There are different types of nebula. An emission nebula e.g. such as Orion nebula, glows brightly because the gas in it is energized by the stars that have already formed within it. In a Reflection Nebula, starlight reflects on the grains of dust in a nebula. The nebula surrounding the Pleiades Cluster is typical of a reflection nebula. Dark Nebula also exist. These are dense clouds of molecular hydrogen which partially or completely absorb the light from the stars behind them e.g. the Horsehead nebula in Orion. Planetary Nebula are the outer layers of a star that are lost when the star changes from a red giant to a white dwarf.   Shop now at Amazon Pantry at best deals Amazon Pantry STAR A star is a luminous globe of gas producing its own he...
Read more

GRAVITY

-
Image
GRAVITY What is Space Time Continuum? Time is not completely separate from and independent of space, but is combined with it to form an object called space-time. It is a matter of common experience that one can describe the position of a point in space by three numbers, or coordinates. For instance, one can say that a point in a room is 7 feet from 1 wall, 3 feet from another and 5 feet above the floor. Or one could specify that a point was at a certain latitude and longitude and a certain height above sea level. One would not specify the position of the moon in terms of kilometres north and kilometres west of a building on Earth and some feet above sea level. Instead, one might describe it in terms of distance from the Sun, distance from the plane of the orbits of the planets, and the angle between the line joining the Moon to the Sun and the line joining the Sun to a nearby star such as Alpha Centauri. Even these coordinates would not be of much use in describing the position of the ...
Read more

THE SOLAR SYSTEM

-
Image
Here are some amazing elements that our SOLAR SYSTEM consists.  1. Sun The Sun is a star present at the centre of the Solar System. It is spherical in shape and is emmiting huge amount of light and infrared radiations with heat due to the nuclear fusion reactions in its core. It is a type of G-Typemain Sequence Star with a life span of approximately 10 billion years.  2. Planets Our Solar System consists of eight planets named Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune, ordered in their respective distances from the Sun.  The smallest and the nearest planet to the is Mercury and the largest planet is Jupiter. The hottest planet is Venus and the coldest is Neptune. Listed below is the time taken by every planet to rotate around its Axis and revolve around the Sun. Planet             Rotation              Revolution    1. Mercury.    58d 15h 30m    ...
Read more

CRAZY SCIENCE EXPERIMENTS IN SPACE SHUTTLE

-
Image
Outlined below are some of the coolest Space Shuttle Science Experiments: 1. Microbes Get More Virulent In Microgravity. Experiments aboard the space shuttle have shown that salmonella bacteria, a   common and sometimes deadly source of food poisoning, get more virulent in space. Scientist believe that the bacteria get ramped up because space flight tricks them into behaving as if they're inside the human gut. The shuttle missions also identified dozens of genes that seem to be involved in the hyper-virulence, as well as "master switch" protein that regulates many of these genes.  2. Space Roses Smell Different. It sounds like some sort of symbolic or ceremonial gesture: The Shuttle Discovery carried a single rose to orbit on its STS-95 mission in 1998. But there was science, and business, behind the move. The company International Flavours and Fragrances (IFF) wanted to see how microgravity altered the sweet and familiar scent of a Rose — and if a new perfume component m...
Read more

NASA FOUND SALT TRACES ON MARS...

-
Image
Recently, after the testing of the samples brought from the Red Planet (Mars), NASA said that there are some possibilities of organic salt present on Mars. After this research of NASA our understanding of Mars's surface will improve. Also this will help in finding life forms in Mars as well as on different Planets. In an interview NASA said that organic compound and salt traces on Mars could be a mark of geographical processes or bacterias, like that of found by the Curiosity Rover. Salts Could Be Made from Geological Processes..... According to one research, the iron, calcium and magnesium oxalate and acetate affected by radiation and oxidation together can combine to mix up with the organic salts. These salts could be made from Geological Processes or these are the remains of micro organisms. Possibilities Of Life On Red Planet Increases.... According to NASA traces of salt could increase the possibility of organic matter present on Mars. On Earth as well such type of life forms ...
Read more