Stars Emit The Same Light As The Sun

For hundreds of years scientists have suspected that there are planets around other stars. So they are looking for ways to find planets in other stars. It is not easy. Exit and look to the sky during the day and night. The only glowing light is the Sun, while the other stars are only in the night sky. Though the planet is much smaller than the stars. Like basketball and marbles. So if there's a big star, what about planets?

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It's about size. Stars emit the same light as the Sun, while the planet does not. The light of stars that look like tiny dots in the sky, will surely dominate and mask the existence of a very small and lightless planet.

For example, there are cars parked in front of the house, and there is a car that turns on the lights. Now, we are at the end of the road 1 km from the car. Can anyone see mosquitoes passing in front of the car's lights? Well, that's how difficult it is to find our very small planet in comparison to other stars that emit bright light, and just look like a point from the earth.

The star is very far, m to find the star of course by seeing or photographing directly with the telescope. But, it's still very difficult! Because it can only be applied to the nearest star.

Alternatively: Astronomers try to find the planet in another star indirectly. Astronomers discovered the planet by looking at the changes that occur in the star because of the planet surrounding the star.

There are several ways that astronomers use to detect planets indirectly. The most commonly used method is radial velocity.

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In this way, astronomers see the disturbance caused by the planet's gravity as it travels around the star. Although the interference effect of the planet is very small, but the star is likely to shake and the speed of the star will change slightly. The star will appear to move closer to or away from the observer. However, the changes will not be visible directly. Therefore, astronomers see the wobble of stars on the changes that occur in the spectrum of light received from the star. If the star moves toward the earth, its spectral line will move toward the blue. If away from earth, the spectral lines will be red. If that change happens, then there is a planet that surrounds the star.

Another way that is also often used is the transit method. The principle is like an eclipse. Astronomers are looking for a change in starlight as the planet moves across stars and observers on Earth.

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The easiest example is the solar eclipse. When the moon is between the earth and the sun, the sunlight will disappear because it is blocked by the Moon. So it happened in another star. When a planet passes in front of its host star, the starlight dims, allowing astronomers to know that there is a planet in it. But, because the star is so far away and the planet is so small, the light is slightly changed, so its star will look like blinking when there is a planet passing by. The transit method that Wahana Kepler uses to search for planets in other stars.

There are still some other indirect methods, but the most commonly used methods are the two methods listed above (That's what I know). Keep in mind today has found more than 1,000 planets, and there are still thousands of would-be planets to be found.

Thank you, this is my writing for this time, if there are words that are not good, not polite, not clear. I can only apologize. Perfection belongs only to God, I am only human who can not escape from mistakes. So, greetings from me @youngky. For my friends in steemit and for all my faithful followers.

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