Ring galaxy formed when another galaxy punched through its disc, sending out a ring-shaped shockwave.
No small telescope will show you this one; it is here to be understood, not spotted.
Anything light from there tells us is news about 430 million years old.
| Across | about 160,000 light-years |
|---|---|
| Distance from us | about 430 million light-years |
| How big it looks | about 1.3 arcminutes — the full Moon is about 30 |
We use about 430 million light-years: the time its light has been on the way, worked out from its redshift (NED, z = 0.0302) with the Planck 2018 values for the expanding universe; a faster expansion, as some measurements give, makes it about 7% less. The 500 million often quoted matches no kind of distance.
Hoag’s Objectring galaxyBeyond a 150 mm telescope
The Milky Wayspiral galaxyNaked eyeThe Andromeda Galaxy (M31)spiral galaxyNaked eyeThe Triangulum Galaxy (M33)spiral galaxyBinoculars
The Large Magellanic Cloudirregular galaxyNaked eyeBode’s Galaxy (M81)spiral galaxyBinoculars
Show the Cartwheel Galaxy in the model
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