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 >
Humans cannot hear sounds in outer space, because in order for the human ear to detect sound, a sound wave must have a medium, like air or liquid, to push and travel through, eventually exerting that pressure on the eardrum and allowing the ear to hear the sound. There is not enough of a medium of molecules in space through which sound can properly travel, which is why the human ear cannot detect sound in outer space.Full Answer >
The sky ends at the Karman line, which is located at about 67 miles above sea level. Above this line, space begins. However, technically, the sky does not end so much as the atmosphere, or sky, thins until there is no oxygen left.Full Answer >