Have you ever been on your way to meet some friends and, while en route, called to tell them you’re running late? If you could travel at the speed of light, you could circle the globe of Earth almost eight times in one second. Traveling at that speed, you would encircle the globe of Earth almost eight times in one second. A light beam needs only 8 minutes to travel the 93 million miles (150 million kilometers) from the sun to the Earth.
The red star in the center of this picture is Proxima Centauri, our sun's nearest neighbor among the stars. The main reason for using light years, however, is because the distances we deal with in space are immense.
The Milky Way galaxy in which our sun and all the stars we see at night reside spans 100,000 light-years from one end to the other.
Moving beyond our galaxy, it’s just over two million light years to our nearest galactic neighbor, the Andromeda galaxy.
Hubble Ultra Deep Field image from 2004, one of the deepest images of galaxies in our universe. The Literaturhaus is located in the center of Stuttgart, close to "Berliner Platz", "Bosch-Areal" and "Liederhalle". Here you find a map including the Literaturhaus, the Hotel Sautter and the Hotel Feuersee (10 min walk to Literaturhaus). All regional and long-distance trains arrive at Stuttgart Hauptbahnhof (HBF-Central Main Station). If you arrive at Stuttgart Airport, you can take the local train called the S-Bahn (sign-posted with a big green and white "S"). If you're coming directly to the conference location, get off at the station "STADTMITTE" and use the map.
If light from the sun takes eight minutes to get to us, then we’re actually seeing the sun as it was eight minutes ago.


If you’ve ever seen fireworks, for example, you know that you see the explosion and then a few seconds later you hear it.
If we stick to miles or kilometers we quickly run into unwieldy numbers just measuring the distance to the nearest star: a dim red dwarf called Proxima Centauri that sits a mere 24,000,000,000,000 miles away! Putting that into perspective, the duration of recorded human history is roughly 5,000 years.
The light we currently see from that galaxy left there about the same time the ancestors of modern humans were first discovering stone tools. It’s also here where the trickiness of measuring distance in an ever-expanding universe becomes apparent. Oftern, the flights to Frankfurt are cheaper and it is quite convenient to take a train from Frankfurt to Stuttgart.
Think of it as the bigger, badder cousin of the inch, the mile, the kilometer, and the furlong. You’re using how long it will take you to get there as a substitute for how far away you are.
Throughout the universe, all light travels at exactly the same speed: about 670 million miles per hour. So if you were to travel off the Earth in a straight line at light speed, you’d get pretty far in the same amount of time, right?
If you close your eyes during the fireworks show, you’d only have your ears to know when things were happening. So light from a star at one end of our galaxy takes 20 times longer than all of recorded history to get to the other end.
The light we see coming from the farthest depths of the universe has been traveling across the cosmos for almost three times longer than our planet has existed: nearly 14 billion years! A galaxy whose light took 14 billion years to reach our little planet has, in the intervening aeons, moved even further away. After eight years of searching for exoplanets, probing distant galaxies and exploring comets, Chris realized he enjoyed talking about astronomy a lot more than actually doing it.


If you arrive at Frankfurt, you can take a train (ICE High Speed Train) directly from the airport to Stuttgart Hauptbahnhof (main station) and follow the directions above. Astronomers do the same thing when figuring out the distance to a star or galaxy, but instead of relying on how fast they could drive or walk, they use a beam of light as their reference. We don’t usually think about light traveling anywhere because when we flick on a light switch – there it is! Since it takes some time for the sound to get to you, you’d always be hearing things a few seconds after they happened.
The current physical distance to that remote beacon, if we stopped the universe from expanding and stretched out a really long tape measure, is just over 46 billion light years! After being awarded a 2013 AAAS Mass Media Fellowship to write for Scientific American, he left a research career at the U.S.
The same happens with light: we only see something once the light from that event actually gets to our eyes.
Put another way, it takes the light from our stellar next door neighbor four years to get to Earth. Naval Observatory to pursue a new life writing about anything and everything within the local cosmological horizon.
When we’re looking across a room, the time delay is only a few billionths of a second. But when we start looking across large enough distances, the light becomes noticeably delayed like the sounds are from exploding fireworks. From here to the edge of our vision spans a distance of approximately 276,000,000,000,000,000,000,000 miles.



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Comments to «How to take long distance photos at night yahoo»

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    Incorporates some border areas and the sprocket holes used to move specks of dust.