|Such factors as Earth's atmosphere , the ozone layer, the presence of oxygen and water, light from the sun and the force of gravity.
|Factors That Allow Life On Earth
|Closest to the Earth, this layer of the atmosphere is where weather and the water cycle occur, more that 1/2 of the air in the atmosphere exist here (densest layer), only layer we can breath in!
|Second layers from Earth's surface, this is where jets fly, it contains the jet stream at the base and ozone layer at the top.
|The middle layer is the coldest layer of the atmosphere, meteors burn up here due to collision with certain gases.
|The fourth layer from Earth's surface, this is the hottest of all layers, auroras occur here.
|The outermost layer of the Earth's atmosphere, some satellites orbit here.
|Air is a mixture of gases and has mass. It is composed of: 78% nitrogen, 21% oxygen, and the last 1% is a mix of other things such as CO2(Carbon Dioxide), Noble gasses and water vapor.
|Wind from convection currents because warm air rises and cool air, which is denser, descends- This creates a cycle of air motion that create(s) currents.
| Bad ozone- Which exists at the top of the Troposphere, is a by-product of burning fossil fuels and a pollutant. Good ozone- Exists at the top of the Stratosphere and absorbs harmful UV Rays and the high temperatures that would accompany them.
|A force must be applied greater than the force of gravity to lift-off in order to get out of out atmosphere.
|Launching Into Space
|Some of the basics include: oxygen, a space suit, water, food, and a space vehicle.
|Accommodations For Space Exploration