London type smog

London type smog ocures when particles in coal smoke combine with water droplets in humid air. hundred years London was a dirty and dark place because all the coal the people were using plus the humid air was creating smog which is now known as London. now days people in London try to burn less coal and the air there is now looking much cleaner. some consequences are giving people lung diseases, harder to breath in the air,and global warming. so we should try to not pollute so much, and we can save our ozone layer and save peeps from getting diseases.

earths atmosphere

The Earth, unlike Mercury, has an atmosphere. the Earth's atmosphere is 78% nitrogen, 21% oxygen, and 1% of other substances. since mercury has no atmosphere, there is no weather. also at night it is freezing cold since there isn't an atmosphere to trap the heat, when it is day time on mercury it is blazing hot since it doesn't have the atmosphere to protect it from letting to much heat onto the planet. If you were to walk on mercury, your footprint would be there forever since there would be no wind or rain to wash it away. The atmosphere is what cause earth to have weather. if you were to walk on the ground on earth, then by a few days it would all go away. that is how earth is different from mercury

The Space Program

NASA begun in 1958, they began a mission to mercury to see if people could survive in space. then they started doin apollo missions to send people to the moon. an accident occured in 1970 and they called it apollo 13. that didnt stop the space program though. even today people fly into space to go to the moon or go to a space station

using space science on earth

people belive that money should be spent elswhere instead of for the space program, the space program recieves very little of the u.s buget. Nasa is trying to explain that the space station is used for great knowledge and uses. hopfully they can keep it going

Exploring space today

The ISS has included a small robot called the Personal Satellite Assistance. it is powered by solar cells and can monitor temperature, pressure, and air quality to alert an astrounat to any problem in space. it also comes with a small video phone so the astrounats can cummunicate with eachother.

the science of rockets

New versions of rockets are 58 meters high and usually made up of 3 stages. First stage is the atlas, second stage is the centuar and the third is the payload. Atlas rockets were used to launch people onto the moon but now are used to launch satellites into space.