How astronomers measure interstellar distances ???

The first method for measuring distance to a star is using a parallax , i.e triangulation.It's a method in which the change in position of a celestial body caused by the motion of the earth with respect to an observer on earth along with a little trigonometry  is used to determine the distance .

               

Another method is to use standard candles .A standard candle is a class of astrophysical objects, such as supernovae or variable stars, which have known luminosity due to some characteristic quality possessed by the entire class of objects.Thus comparing the standard candles with other astronomical objects;we are able measure huge distances.To find out more on how spectrum of stars tell us about them click here.

Did man evolve from monkeys?????. !

Stephen Hawking had said that '' The greatest enemy of knowledge is not ignorance,It is the illusion of knowledge''. What he meant is pretty clear.We may perceive that we are sure about something but you may not be.

 Such illusions of knowledge is all over the society .This phenomenal illusion will drive us deep into the horrid black holes of ignorance.Many such illusions can be seen in cultures across the globe.Some of them are religious, but some of them are even scientific.                                                                

Religion tells that man was created by god.While many others  believe that man evolved from monkeys. But science tells that man(Homo sapiens) and monkeys evolved separately; but from a common ancestor.It is even more funnier that many of us still believes that each race is a different species. There is no biological basis to the notion of human races.All human are a single species.The very definition of a species tells us that a species is a group of individuals capable of interbreeding.There is no better evidence to prove that humans are one race .Still our genetic footprints can be traced back to Africa.

Several other scientific myths can be still found.Let us question them until there is no more questions to ask..............................................................................???????????????????????.