1. Distance
A light-year, abbreviation: ly, is a unit of length used informally to express astronomical distances. It is approximately 9 trillion kilometres or 6 trillion miles. The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specia
2. Mars and Jupiter
The asteroid belt is the circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets.
3. convection
Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection takes place when heated molecules move from one place to another, taking the heat with them.
4. less dense
Pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.
5. The northern lights
The Northern Lights are actually the result of collisions between gaseous particles in the Earth's atmosphere with charged particles released from the sun's atmosphere.
6. Archimedes
7. Chennai
Archimedes' Principle was one of the important discoveries by him. Other major discoveries include Archimedes' Screw and Claw of Archimedes. Through the “Method of Exhaustion”, he approximated the value of ฯ.
8. Kojya
Modern names "sine" and "cosine" are mistranscriptions of the words jya and kojya as introduced by Aryabhata. Aryabhata's definitions of sine (jya), cosine (kojya), versine (utkrama-jya), and inverse sine (otkram jya) influenced the birth of trigonometry.
9. Charles Darwin
The full title was "On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life" and is considered to be the foundation of evolutionary biology.
10. Jonas Salk
The first polio vaccine was the inactivated polio vaccine. It was developed by Jonas Salk and came into use in 1955.The Pasteur Institute in Paris nearly simultaneously announced an effective polio vaccine. The oral polio vaccine was developed by Albert Sabin and came into commercial use in 1961
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