Why is the sky blue? The earth is surrounded by an atmosphere. ... How much does the earth weigh? ... How far away is the sun? ... What is a black hole? ... How do airplanes fly? ... How do flies walk on the ceiling? .((eauvrazmwm))
Answers
1) The sky is blue due to a phenomenon called Raleigh scattering.
2) earth weights 5.972 × 10^24 kg
3) 147.38 million km
As noted earlier, Earth's average distance to the Sun is about 93 million miles (150 million kilometers) from the Sun.
4) A black hole is a region of spacetime where gravity is so strong that nothing — no particles or even electromagnetic radiation such as light — can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
5)Airplanes fly because they are able to generate a force called Lift which normally moves the airplane upward. Lift is generated by the forward motion of the airplane through the air. This motion is produced by the Thrust of the engine
6) Flies need sticky feet to walk on ceilings, but not so sticky that they get stuck upside down. So each foot comes with a pair of claws that help hoist the gooey foot off the wall. Flies use several different techniques to get unstuck: pushing, twisting, and peeling its footpads free.