In order to determine how long it takes to light to reach our beautiful blue planet we have to put into context some important data such as distances, speeds and because not also dimensions.
Our blue planet is part of a group of planets that are revolving around a yellow star thanks to the gravitational force of the host star christened sun by us humans, this star that is in its main phase has a size Of 695,700 km much larger than our planet that has only 6,371 km radius, together the sun and the other planets form a planetary system consisting of 8 planets and 5 dwarf planets.
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Our Planet Earth as we can see in the image occupies the third position counting from the sun to the outer planets, and if you have noticed it we are hardly a dot in our solar system, imagine it comparing it with the universe, let us now speak of distances, Not be far from the sun compared to the distances so large that exist in the universe the journey that light of our star has to pass to get here if it is large enough to take a little, this distance is 149.6 million kilometers in That distances would fit approximately 23,481 earth planets to have an idea, light on the other hand as moving objects takes time to travel a distance that on earth being so small we can barely notice, the speed of light in the void At least in this part of the universe is about 3x108 m / s, if we could travel at this speed, maybe we could give at least 7 turns to the earth in 1 second.
Now having these we will be able to calculate an approximate of the time that takes him to light arrives here, to this beautiful blue little ball.
The light travels 300,000 kilometers in every second, then to travel 149,600,000 kilometers needs 498.6 seconds. Why:
149,600,000 [km] / 300,000 [km / s] = 498.6 [s]
Now, let's transform these data to minutes, if we have to:
1 minute = 60 seconds
X min = 498.6 seconds
Then making a simple rule of three we obtain the following:
X = 8.31 minutes
This is the approximate time it takes light to reach the earth, by which the light that reaches us from our star had to take all that time so that all who inhabit this planet can enjoy it and its heat.
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