What would happen if the atmosphere is gone?
Eventually (long after surface life died), solar radiation would break atmospheric water into oxygen, which would react with carbon on the Earth to form carbon dioxide. The air would still be too thin to breathe. The lack of atmosphere would chill the Earth's surface. Organisms that need air to breathe would die.
So, even though typical clouds do contain a lot of water, this water is spread out for miles in the form of tiny water droplets or crystals, which are so small that the effect of gravity on them is negligible. Thus, from our vantage on the ground, clouds seem to float in the sky.
- Virtually all types of clouds and precipitation are due to rising air. On the other hand, as air sinks, its temperature rises and its capacity for holding vapor increases. Then any cloud droplets tend to evaporate and the cloud itself disappears; evaporation changes moisture back from liquid into gas.
- What does it feel like when we touch clouds? A cloud is made of water droplets or tiny ice crystals. As the water droplets rise high in the sky, the air gets cooler, causing the water droplets to adhere to particles of dust in the air. The droplets are so light they float in the air.
- Clouds are made up of tiny water droplets or ice crystals, usually a mixture of both. The water and ice scatter all light, making clouds appear white. If the clouds get thick enough or high enough all the light above does not make it through, hence the gray or dark look.
They themselves sometimes produce virga, which is rain or snow that does not reach the ground. Low-level clouds lie below 6,500 feet (2,000 meters). Meteorologists refer to them as stratus clouds. They're often dense, dark, and rainy (or snowy) though they can also be cottony white clumps interspersed with blue sky.
- So, even though typical clouds do contain a lot of water, this water is spread out for miles in the form of tiny water droplets or crystals, which are so small that the effect of gravity on them is negligible. Thus, from our vantage on the ground, clouds seem to float in the sky.
- The list of cloud types classifies the tropospheric genera as high (cirrus, cirrocumulus, cirrostratus), middle (altocumulus, altostratus), multi-level (nimbostratus, cumulus, cumulonimbus), and low (stratocumulus, stratus).
- Clouds form when the invisible water vapour in the air condenses into visible water droplets or ice crystals. There is water around us all the time in the form of tiny gas particles, also known as water vapour. There are also tiny particles floating around in the air - such as salt and dust - these are called aerosols.
A "falling star" or a "shooting star" has nothing at all to do with a star! These amazing streaks of light you can sometimes see in the night sky are caused by tiny bits of dust and rock called meteoroids falling into the Earth's atmosphere and burning up.
- As far as the origin of this practice is concerned, legend has it that wishing upon a shooting star makes the wish come true. This belief dates back to around AD 127-151 when Greek astronomer Ptolemy wrote that occasionally, out of curiosity or even boredom, the Gods peer down at the earth from between the spheres.
- The core finally cools into a white dwarf, then a black dwarf. This is what happens when a normal-sized star dies. If a really huge star dies, it has so much mass that after the helium is used up, it still has enough carbon to fuse it into heavy elements like iron. When the core turns to iron, it no longer burns.
- Close your eyes while wishing. If you get lucky enough to see a shooting star, close your eyes before wishing. Then say, “Starlight, star bright, first star I see tonight: I wish I may, I wish I might, have this wish I wish tonight.” This old rhyme is rumored to make your wish come true.
Updated: 25th November 2019