HELLO GUYS, I will be explaining to you how we know what the stars are made of. Each Star Produces its own individual light. By splitting the light in a spectrum, astronomers can discover the chemical elements in the star’s atmosphere absorb light of different wavelengths. Sodium atoms, for example, only absorb light from the yellow part of the spectrum, called an absorption line, tells scientists that there is sodium in the star. By studying the various lines made on the spectrum, scientists can determine what the star is made up of.
HELLO GUYS, I will be defining to you what is a space launcher. SPACE LAUNCHERS are rockets that carry payloads into space. Just as there are many sizes of truck to carry different goods from place to place, there are many different space launchers, each suited to different purposes. Rockets such as the Mercury- Atlas were designed to be small and light, as they only had to carry one man. Russia’s Soyuz series are incredibly powerful, able to carry 20 tonnes into a low – Earth orbit. NASA’s Saturn V was designed to be powerful enough to carry three men to the Moon.
The passion for the motor car turned into racing and by the end of 19 th century the first racing car competitions had begun. To begin with, there were no limits or rules as to the types of cars taking part in different races, and the competition was open to almost any method of transport on four wheels. Then from 1906, the competition was divided into two major groups of ‘formula cars’, both of which were free to experiment with technical improvements to make the car perform better. The first group were the course formula cars , with specifications as to the number of engine cylinders, fuel consumption and the size of the car. The second group were the free group which had no specification limits. Formula 1 racing began in 1946, and from the time it was officially establish in 1950, it was destined to become the most famous racing car competition in the world. Formula 1 began as a raci...
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