20 interesting information about lighting you may not know
Here are twenty facts / useful information about the most interesting light, please read.A light-year ... 225 million years of walking
If your walk begins before the dinosaurs appear on Earth, then to complete the journey of a light-year, it has just finished recently.What is the light year? How many kilometers is a light year?
When it comes to the distance of other Sun stars in our sky, people do not use miles or kilometers, but use a unit of measurement called Light years.Earth is closer to the black hole than expected
Dutch astronomers measured the relative distance between the earth and the nearest black hole.