A Bird Can Fly 25 Km/h How Long Does It Take to Fly 3.5km
Here'south a question… how long does it take sunlight to achieve Globe? This sounds like a strange question, only recollect about it. Sunlight travels at the speed of low-cal. Photons emitted from the surface of the Sunday need to travel across the vacuum of space to reach our eyes.
The brusque answer is that information technology takes sunlight an average of 8 minutes and twenty seconds to travel from the Sun to the World.
If the Sun suddenly disappeared from the Universe (not that this could actually happen, don't panic), it would take a lilliputian more than 8 minutes earlier you realized it was time to put on a sweater.
Hither'south the math. We orbit the Sun at a distance of nigh 150 meg km. Lite moves at 300,000 kilometers/2d. Divide these and you get 500 seconds, or eight minutes and twenty seconds.
This is an average number. Remember, the World follows an elliptical orbit around the Lord's day, ranging from 147 million to 152 million km. At its closest point, sunlight simply takes 490 seconds to reach Earth. Then at the most distant betoken, it takes 507 seconds for sunlight to make the journeying.
Simply the story of low-cal gets even more interesting, when you think about the journey light needs to make inside the Dominicus.
Y'all probably know that photons are created by fusion reactions inside the Sun's core. They kickoff off as gamma radiation and then are emitted and absorbed endless times in the Sunday's radiative zone, wandering around inside the massive star earlier they finally attain the surface.
What you probably don't know, is that these photons striking your eyeballs were Actually created tens of thousands of years ago and it took that long for them to exist emitted by the sun.
In one case they escaped the surface, it was only a short viii minutes for those photons to cross the vast altitude from the Sun to the Globe
Every bit you lot look outward into space, you're actually looking backwards in time.
The lite yous come across from your computer is nanoseconds quondam. The calorie-free reflected from the surface of the Moon takes only a 2nd to reach Globe. The Sun is more than 8 light-minutes away. So, if the lite from the nearest star (Alpha Centauri) takes more than than 4 years to reach united states of america, we're seeing that star 4 years in the past.
In that location are galaxies millions of low-cal-years away, which means the calorie-free we're seeing left the surface of those stars millions of years agone. For instance, the galaxy M109 is located about 83.5 million light-years abroad.
If aliens lived in those galaxies, and had strong plenty telescopes, they would see the World every bit it looked in the by. They might even see dinosaurs walking on the surface.
Commendation: How long does information technology take sunlight to reach the Earth? (2013, April xv) retrieved 15 Feb 2022 from https://phys.org/news/2013-04-sunlight-earth.html
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Source: https://phys.org/news/2013-04-sunlight-earth.html
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