Four layers of the earth's atmosphere containing various gases make up the composition of the sky. The layers of the atmosphere are divided into the troposphere, the stratosphere, the mesosphere and the thermosphere. The atmosphere's divisions occur according to temperature fluctuations.Know More
Nitrogen and oxygen are the two major gases present in the atmosphere. Nitrogen accounts for 7 percent of the earth's atmosphere while oxygen comprises 21 percent. Several other gases are present, but they make up a very small portion of the total gases. One smaller gas group that exists in the atmosphere is the greenhouse gas group. Carbon dioxide is the prominent gas from this group. Greenhouse gases in excess can be detrimental to the earth as they contribute to global warming, but when the gases are in proper proportions they aid in warming the earth for inhabitants to survive comfortably.
The troposphere, the layer of atmosphere closest to the earth, is where weather takes place. The word "troposphere" originates from the word "tropein," which means "to turn or change." The troposphere extends approximately seven miles from the earth's surface and has pressure ranges from 1000-200 millibars (a measure of atmospheric pressure). Temperature decreases with increasing height into the troposphere. Wind increases with height. Moisture concentration decreases with height. Oxygen is not able to survive in any layer higher than the troposphere because it has low density.Learn more about Astronomy
Although a shooting star looks like a star shooting across the sky, it's actually a meteor, or small rock that hits Earth's atmosphere. Because of the speed at which the meteor, or meteoroid, is traveling it burns and releases a glow.Full Answer >
Non-optical telescopes examine light from the sky at wavelengths other than those of visible light. Many different types exist to study incoming radio waves, microwaves, infrared and near-infrared rays, ultraviolet rays, X-rays and gamma rays.Full Answer >
A person who studies space is called an astronomer or astrophysicist. These types of scientists are responsible for the discovery of all of the planets, stars, asteroids and other extraterrestrial objects.Full Answer >
The moon has phases with distinct appearances because it is constantly rotating around the Earth and being illuminated by the sun at different angles. The most common phases are the new moon, first quarter, full moon and last quarter.Full Answer >