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Stars: Classification of Stars and how they categorize.

At first, glance stars pretty much all look alike. Twinkling dots scattered across the sky. When we look closely we see the difference. Some look brighter and some look dull, sometimes that due to them being at different distances but it’s also true that stars emit a different amount of light too. If we look through Binoculars or take pictures of them, we'll see that they're all different colors, too. Some looks white and some looks red, orange. A spectrum is a result when we divide the incoming light from an object into individual colors or wavelengths. This reveals the vast amount of physical data about the object. But in the late 1800s we were only starting to figure out, Interpreting stellar spectra was a tough problem. The spectra we measure from the star are a combination of two different kinds of spectra. Stars are hot, dense balls of gas, so they give off a continuous spectrum; that is they emit light of all wavelengths. However, stars also have an atmosph...
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Hawking Radiation

Hawking's Radiation Black holes: What is Blackhole?, What we know about black holes? How they work?, Is there is any black hole in our Universe. All these questions annoying physicist for the last 5 decades. We all know that Event horizon is Point of no return in black holes. In Actual, Event horizon is a boundary of black hole outside the event horizon an object can pass unless it faces the gravitational pull from the black hole, but if an object crosses the boundary of event horizon then it becomes impossible for an object to escapes from its strong gravitational pull, Even light cannot be able to escape from its strong gravitational pull. Normally, when we are talking about strong gravitational pull actually we're talking about the boundary of the Event horizon. Stephan Hawkings first discovered that light rays which enter event horizon and light rays which are outside the event horizon doesn't approach each other. It means that the area of even...
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Moon Phases

Moon Phases  Besides the Sun, the Moon is the most obvious object in the sky. Bright silvery with tantalizing features on its face, it's been the target of our imagination, poetry, science and even the occasional rocket.  If we pay most the most cursory attention to it, we'll see that it changes everyday; sometimes it's up in the day, sometimes at night , and even its shape is always changing.  What's causes this Behavior?  The moon is basically a giant ball of rock 3500 km across in space. It's surface is pretty dark, with about the same reflectively as a chalkboard or asphalt. However, it looks bright to us because it's sitting in full sunlight; the sun illuminates it, and it reflects that light down to us here on Earth. And because it's a sphere, and orbiting the Earth, the way we see it lit by the Sun changes with time. That's what's causes its phases : Geometry.  The important things to remember through all is; ...
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