The Boomerang Nebula located 5,000 light years away from our home planet is measured -457.87*F or -272.15*C in temperature. It is believed to be a star system in the constellation Centaurus.
There is mostly plains in the US
The atmosphere layer closest to the earth is referred to as the troposphere. Beyond the troposphere are the stratosphere, the ozone layer, the mesosphere, and the thermosphere. The atmosphere is made up of 78% nitrogen, 21% oxygen, and smaller amounts of argon, carbon dioxide, helium, and neon.
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Transportation has changed quite a bit since the "olden days." Nowadays, going from one part of the world to another in mere hours is not a fantasy any longer, the way it used to be hundreds of years ago.
Airports have started catering to international flights more in the 1930s than a decade before when they focused more on regional and municipal travels. This enabled people to travel the world for pleasure or work. With the development of airports and international travel, tourism also flourished - hotels, restaurants, etc. began sprouting up everywhere to attract tourists and travelers.
The automobile industry grew rapidly as well - one example would be Henry Ford's Model T because it was affordable, and therefore mass-produced so many people could have it.
The US started focusing on building more freeways as that is the most popular way to transport goods within the country. In the past, roads were used but with the 'invention' of more practical ways of transportation, this process was sped up.
In other parts of the world, like the UK, the first subway systems appeared, namely, London Underground in 1863. This saved the city from automobile congestions and transferred part of its travel underground.
And there are many other great inventions and improvements to come in the future.
