The summer Milky Way overhead and through the Summer Triangle stars in July, looking up through trees in Banff National Park at Herbert Lake Deneb is at top left, Vega at top right, and Altair is at bottom The bright Cygnus star cloud is obvious As are the dark lanes in the Milky Way, including the Funnel Nebula at top, aka Le Gentil 3   This is a stack of seven exposures for the trees, mean combined to smooth noise, and one exposure for the sky, all 20 seconds at f/2 with the Laowa 15mm lens and Sony a7III at ISO 6400. (Photo by: VW Pics/Universal Images Group via Getty Images)

1134062152

The summer Milky Way overhead and through the Summer Triangle stars in July, looking up through trees in Banff National Park at Herbert Lake Deneb is at top left, Vega at top right, and Altair is at bottom The bright Cygnus star cloud is obvious As are the dark lanes in the Milky Way, including the Funnel Nebula at top, aka Le Gentil 3 This is a stack of seven exposures for the trees, mean combined to smooth noise, and one exposure for the sky, all 20 seconds at f/2 with the Laowa 15mm lens and Sony a7III at ISO 6400. (Photo by: VW Pics/Universal Images Group via Getty Images)

Photo by: Getty Images/VW Pics

Getty Images/VW Pics

You've Never Seen a Picture of the Entire Milky Way

By: Ashley Hamer

It's easy to believe that a picture of the Milky Way exists—but it doesn't.

August 01, 2019

Search the internet for pictures of the Milky Way — our home galaxy — and you'll find all sorts of images: bright smudges across the night sky taken by high-end cameras, a horizontal streak taken by powerful telescopes, and an entire spiral galaxy taken by — wait a second. If we live inside of the Milky Way, how do we have pictures of the entire Milky Way? Spoiler alert: We don't. Not real ones, anyway.

Photo by: The Hubble Heritage Team/AURA/STScI/NASA

The Hubble Heritage Team/AURA/STScI/NASA

That's Here, That's Home

Earth is located in the Milky Way, but it's nowhere near the middle. We're about 25,000 light-years from the supermassive black hole at the center, and also 25,000 light-years from the outer edge. As Matt Williams writes for Universe Today, if the Milky Way were a vinyl record, we'd be in the groove halfway between the center and the edge. The galaxy itself is shaped like a disc, with a bulge in the center and some warping thanks to the pull of the galaxies nearby.

If you head for an area mostly free of light pollution, like a Dark Sky Park, you can gaze up at and see a faint glowing band streak across the night sky. That's the cross-section of the Milky Way we can see from our vantage point on Earth. (To return to the metaphor, if you were sitting on the outer edge of a vinyl record, you would see it as a flat line, not a circle. Same goes for our galaxy.)

But that's from ground level. What about from a spacecraft?

So Close and So Far

The spacecraft that has traveled the farthest from Earth is Voyager 1. On the 40th anniversary of its launch in 2017, the craft was 13 billion miles (21 billion kilometers) away. To put that in perspective, one light-year is about 5.9 trillion miles (9.5 trillion kilometers), and our region of the Milky Way is 1,000 light-years thick. It's safe to say we're not going to leave our galaxy in your lifetime.

But that's not to say we don't have some awesome pictures of what we can see — and even some dependably accurate artist's renderings of what we can't. Powerful telescopes like Hubble, Chandra, and Spitzer (and soon, James Webb) capture images of our galaxy in many different light wavelengths, which astronomers piece back together so they can see past the gas and dust as far into the center as possible. And those same telescopes can see other galaxies in their entirety, gathering data that artists use to inform their estimations of what our galaxy actually looks like.

In that way, the images you've seen of the Milky Way are a lot like the ones you've seen of living dinosaurs. No one has seen either with their own eyes, but decades of research has enabled us to make a pretty accurate guess of what they look like.

This article first appeared on Curiosity.com.

Next Up

Scientists Have Discovered Enormous Balloon-Like Structures in the Center of Our Galaxy

There's something really, really big in the middle of our Milky Way galaxy — one of the largest structures ever observed in the region, in fact.

The Perseid Meteor Shower Reaches its Peak

Stargazers rejoice! The annual Perseid meteor shower is upon us. Here's what you need to know...(updated August 11, 2022)

Astronomers May Have Found a Rare “Free-Floating” Black Hole

How do you see a perfectly black object in the middle of a pitch-dark night? It sounds like the start of an annoying riddle, but it’s really the question faced by astronomers when they want to search for black holes.

There's a Reason Your Body Is Tired When Your Brain Is Fried

The mind-body connection is stronger than you think.

Here's Why Static Shock Is Worse in Winter

The electric zap is caused by more than just dry air.

A Russian Scientist Injected Himself With 3.5-Million-Year-Old Bacteria

Did this scientist find the key to eternity frozen in permafrost?

What Would Happen If You Stopped Time?

There never seems to be enough hours in a day.

Why Aren't Fish Electrocuted During Lightning Storms?

The fish have no reason to fear bolts of lightning.

If the Earth Spins East, Why Isn't It Faster to Fly West?

There are a few elements that prevent this theory from working.

4 Up-and-Coming Batteries That Could Overtake Lithium-Ion

Lithium-ion can soon be a thing of the past.