Whirl Wind Colorful Cosmic Waves Energy the universe is connected and new frontiers of knowledge is is a mixed media by Navin Joshi which was uploaded on February 21st, 2015.
Whirl Wind Colorful Cosmic Waves Energy the universe is connected and new frontiers of knowledge is
Whirl Wind Colorful Cosmic Waves Energy the universe is connected and new frontiers of knowledge is coming to human kind on earth.... more
by Navin Joshi
Title
Whirl Wind Colorful Cosmic Waves Energy the universe is connected and new frontiers of knowledge is
Artist
Navin Joshi
Medium
Mixed Media
Description
Whirl Wind Colorful Cosmic Waves Energy the universe is connected and new frontiers of knowledge is coming to human kind on earth.
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Artist NavinJoshi http://1-navin-joshi.artistwebsites.com FineArtAmerica
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The Big Picture
The universe is a big place — too big for us to comprehend. But how big? Astronomers have struggled with this question for millennia, and their view of the known universe has steadily grown to immense and incomprehensible sizes. It’s an important question, and a basic part of our grasp of the universe itself. To study astronomy, it’s essential to understand what’s out there, how everything relates, and where we fit in the universe. The problem is that the size scales, the relative general sizes of classes of objects, are too foreign for things much larger than Earth. In a big universe, this can be a challenge. To tackle the problem, let's try to connect the familiar life-size world around us with the unfamiliar cosmic size scales.
Craie1.jpg
If you're a student, you probably watch your instructor write on the chalkboard almost every day. The chalkboard is something you're much more familiar with than the whole universe because you can see it and touch it. You know the size of the board, the chalk, the markings, the eraser, and so on because they’re right at hand. How much bigger is the board than a dot made on the board with a piece of chalk? It turns out that the answer is about a thousand, for an average sized chalkboard, and a fair sized chalk dot.
Now let's consider something that's a thousand times the size of a blackboard. A blackboard is a few meters across, so we want to think about something a few kilometers across. That's something like the size of a small city. If a city is 1000 times larger than a chalkboard and a chalkboard is 1000 times larger than the mark on a chalkboard, that's a useful connection that helps us think about the size of a city: we can say that the chalkboard in the city is like the mark on the chalkboard.
In this way we will now step out from the city into the larger universe. With each step, we will consider something (very roughly) a thousand times larger than the last step. As we move out, each stop in our journey will be much smaller than the next, like a mark on a chalkboard.
A city is much larger than the blackboard we used as a reference point, but it's still something we are very familiar with. Many people drive across part of their home city and back again every day. It's possible to drive through most small cities in a half hour or so, even with stoplights, and it only takes a few hours to walk from one end to the other. As promised, the next step out will be much larger and farther from our everyday experience. Our next stop will have a size of several thousand kilometers, and that's the size of Earth.
In a car, you can drive across a city in less than an hour, even at a slow speed. If you could drive around the Earth at a speed of 60 miles per hour (100 kilometers per hour), going day and night over land and water, it would take a full 17 days. Remember, driving through a small city at 60 miles per hour would only take a few minutes. Seventeen days is much, much longer than a few minutes. The fastest jets, which have a top speed of about 2,000 miles per hour, (3,500 kilometers per hour,) can make the trip around the world much faster. At that speed, you could circle the Earth in 11 hours. Even speeds like that will quickly become inadequate as we continue moving out into the universe.
The size of Earth is typical of the sizes of the rocky planets, the terrestrial planets, but planets made mostly of gas such as Jupiter and Saturn are larger by a factor of several to ten. In general, we can expect the same kinds of things to have similar properties. Given no other information about a planet, we might guess its radius to be the same as Earth's. If we knew that our imaginary planet were a much larger gas giant, we might change our estimate and guess that the planet has the same radius as, say, Saturn.
This size scale represents the vast majority of human experience. Only a small number of people have ever been in Earth orbit, and these people remained very close to Earth. Most of the satellites launched remain very close to Earth. The shuttle, for example, orbits at an altitude of only a few hundred kilometers — a few percent of the radius of Earth. Some spacecraft are sent to other planets or to the Moon, but the majority stays at the scale of this step in our journey. Only 24 people — the Apollo astronauts — have ever left Earth's orbit to visit the next stop on our journey.
Uploaded
February 21st, 2015
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Comments (3)
John Bailey
Congratulations on being featured in the Fine Art America Group "Images That Excite You!"
NAVIN JOSHI
Buy Posters or or download jpg file for less than $3 from this link http://licensing.pixels.com/profiles/1-navin-joshi.html download, stockart, stockimages, stock art, stock images, navinjoshi, fineartamerica, zazzlelist, Posters,Wrapped Canvas,Perfect Posters ,Photo Prints,Wood Canvas,Wall Decals ,metal prints, canvas prints, phone cases,throw pillows, duvet covers, greeting cards,navinjoshi, navin joshi Artist NavinJoshi http://1-navin-joshi.artistwebsites.com FineArtAmerica http://www.Zazzzle.com/Doonagiri* navinjoshi DOONAGIRI at Zazzle