Earth

Mar172020 by DHNo Comments

How do you Become an Astronaut?

Do you dream of one day being allowed to travel in space? It's not impossible, but it takes a lot to cope with the tough demands of astronauts' psyche. There are also some physical requirements that can be an obstacle for many in the dream to explore space. The only body in Europe that recruits astronauts is the European Space Agency, ESA. They have only organized recruitments three times: 1978, 1992 and 2008. Of course, if you are willing to relocate to the United States, NASA is also a potential recruiter. An astronaut must be fully healthy - for example, you cannot have heart problems. Another obstacle for many is that you have to be a certain length; one must neither be too long nor too short. Finally, some tests have to be done to see if the body can withstand the stresses that ...

Dec232019 by DHNo Comments

Harvard: Block the Sun Chemically to Curb Global Warming

Earth

Filling the lower stratosphere with sulfate could reflect sunlight - and slow down the planet's warming. According to Harvard researchers, it costs just over $ 20 billion a year to spray the entire earth. A dissertation published in Environmental Research Letters explores the possibilities of curbing global warming by spraying the lower stratosphere with sulfate - that is, salts of sulfuric acid. It acts as an artificial volcanic eruption. In the event of major eruptions, the planet has been effectively cooled down, and at the largest it is presumed that the excluded sunlight has contributed to the Earth's ice ages. The ash clouds contain, among other things, sulfur dioxide, which forms sulfate aerosols. The Harvard dissertation states that a similar effect can be achieved chemically...

Dec232019 by DHNo Comments

This is How Little Water Earth Has – Water on Earth

Earth

If all the water is collected, it will only be a small drop compared to the globe. You often hear about the lack of drinking water, but how big are our reserves of water on the planet? How much of it can you drink? About 70 percent of the earth's surface is covered by water. But the total volume of water is only 0.13 percent of the Earth's. To give a visual idea of how little water actually exists, the U.S. The Geological Survey produced an image in which the soil was drained of all water collected into a spherical reservoir located over the United States. The water drop will then have a diameter of 1,385 kilometers, giving a volume of 1.4 billion cubic kilometers. "It holds all the water that is in the seas, lakes, rivers, glaciers, soil, air and even in yourself and your d...