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How big is the Pinwheel Galaxy?

1.7 zettametres!

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Pinwheel Galaxy

The Incredible Size of the Pinwheel Galaxy

Have you ever tried to imagine just how big the universe is? It's a tough question, but let's start with something a bit smaller: the Pinwheel Galaxy. It's not exactly small, but when we're talking about space, it's all relative! The Pinwheel Galaxy, also known as Messier 101, M101, or NGC 5457, is a spiral galaxy that's 21 million light-years away from Earth. To give you an idea of just how far that is, if you were to drive at 60 miles per hour (the average highway speed), it would take you about 40 trillion years to get there. That's almost 3,000 times longer than the age of the universe!

Size Comparison

To truly understand the size of the Pinwheel Galaxy, let's compare it to some things you might be familiar with.

  • The Earth is about 7,918 miles in diameter.
  • The Sun's diameter is about 109 times that of Earth. - Our Milky Way galaxy is about 100,000 light-years across. Now, the Pinwheel Galaxy is about 170,000 light-years across. That means it's almost twice as big as the Milky Way! If our galaxy were the size of a dinner plate, the Pinwheel Galaxy would be about the size of a serving tray.

More Cool Facts About the Pinwheel Galaxy

The Pinwheel Galaxy isn't just big, it's also incredibly beautiful. In 2006, NASA and the European Space Agency released a very detailed image of this galaxy. This image, taken by the Hubble Space Telescope, was the largest and most detailed image of a galaxy at the time. It was made up of 51 individual exposures, along with some extra ground-based photos. Isn't it amazing what we can see with the help of technology? The Pinwheel Galaxy was discovered in 1781 by Pierre Méchain, a French astronomer. He told his friend Charles Messier about it, and Messier added it to his famous catalog of astronomical objects. That's why the Pinwheel Galaxy is also known as Messier 101. So there you have it. The Pinwheel Galaxy is an enormous, beautiful spiral galaxy that's almost twice as big as our own Milky Way. It's so far away that it's hard to comprehend, but with the help of telescopes like Hubble, we can see it in incredible detail. It's just another reminder of how big, beautiful, and amazing our universe really is.

Scale of the Universe > Pinwheel Galaxy
Andromeda Galaxy
The Andromeda Galaxy is the Milky Way's twin. It's the nearest galaxy that is a similar size and shape. In a few billion years, the two galaxies will collide and form one larger elliptical galaxy - Milkomeda.
Milky Way
The Milky Way is the galaxy we live in. You can't see the whole thing at once, of course, but on a dark night you might be able to see a streak that spans the whole sky! It looks milky, so it's the Milky Way.
Cartwheel Galaxy
Astronomers think the Cartwheel Galaxy had a collision with two nearby galaxies 200 million years ago. Actually, 600 million years ago, because the Cartwheel Galaxy is 400 million light-years away, so what we see of it is already 400 million years old.
NGC 1232
NGC 1232 is a pretty big galaxy. It's bigger than ours, but it's not the biggest. Of course, IC 1101 is not the biggest galaxy, it's only the biggest galaxy we know of. There are probably many more!
NGC 4889
This very large galaxy, which is also known as Caldwell 35, is the brightest galaxy in the Coma cluster. It is going away from us at 6,500 kilometers per second. At that speed, it could circumnavigate the Earth in less than seven seconds!
Tadpole Galaxy
The tadpole galaxy has a trail of stars. They were probably formed when another galaxy collided into it. Just like tadpoles, the Tadpole Galaxy is expected to lose its tail as it gets older.

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