Name: スター・ウォーズを見ることができるか？ (Could We See Star Wars?)
Uploaded: 2021-01-14T04:38:00.000Z
Duration: 4 min 1 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

仮定法過去

Hey Vsauce I'm Jake and if Star Wars were to have happened in our universe and truly

occurred a long time ago in a galaxy far, far away ... light from the actions in Star Wars

could be hitting Earth right now, or will some day. So if we pointed a telescope at

the right far away galaxy .... could we see Star Wars? Even if we choose the nearest spiral

galaxy to us, Andromeda, the requirements and results for resolving individual planets,

people or ewoks turns out ... to be almost as disappointing as the Phantom Menace.

To make out the flag on our moon from earth we would need a telescope that's 260meters.

If we wanted a clearer picture, one that would show us the stripes, if they were still

there, we would have to bump the size up to 6,850.

The biggest optical telescopes on Earth have mirrors around 10meters and the largest one

planned, the aptly named European Extremely Large Telescope, will be completed in 2022

and have a 39 meter mirror. Still a good deal smaller than you would need to see the flag

When you try and see small objects that are good distances away, especially when they

have less light, it becomes much more difficult to resolve. For example, here is the best

photo we have of Pluto, and this is a celestial body in our own solar system and relatively

So the reason we can take an amazing image of Andromeda, 2.5million light years away,

is because we are looking at an object that is an estimated 260,000 light years across

and contains a trillion stars. It has to do with the relative size to distance where Andromeda

would be .1 or 200,000 times greater than Pluto's.

If we wanted to be able to see a planet or satellite in a completely different galaxy

like Andromeda, you would need a pretty substantial telescope. To be able to get a glimpse at

the forest moon of Endor, more than double the size of Pluto we would only need a telescope

that was 6...wait for it... million 500 thousand kilometers in diameter. About the size of

But we want to actually see what is happening on the planet. I mean, I want to look at an

Ewok with my own eye because they are adorable. To produce a fairly detailed image we would

need something gigantic, something 1.7 light years large. This telescope would surpasse

Voyager 1's current 18 billion km distance and would be larger than our solar system.

But here is when we run into a slight problem. Bad Astronomy has a great piece about pointing

Hubble at Earth and trying to get a photo. The resulting image would be blurry because

of how quickly it is orbiting. He likens it to "trying to take a picture from a moving

car: nearby objects will streak by, but far away objects appear to be moving slowly."

So even though Andromeda is spatially far away, it is magnified to such a degree that

we'd probably get a very blurry Ewok. The incredibly long exposure time the telescope

would need to collect enough photons to form an image wouldn't help either and whatever

image we were able to produce would have a blue hue since Andromeda is moving so quickly

towards Earth, at a rate of 300km a second, that the light is blueshifted.

Even light coming from people near you has to travel a distance. Since lightspeed is

finite, at arms length you're actually seeing a person 3 nanoseconds younger than they really

are. There is a constant flow of new, old light being spread out across the Universe

so who knows what we might be able to see next, maybe a galaxy far, far away.

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スター・ウォーズを見ることができるか？ (Could We See Star Wars?)

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extremely

constant