Hubble takes gigantic image of the Triangulum Galaxy
One of the largest known stars is VY Canis Majoris.  It's in the Milky Way and has a diameter of 2 billion km.  Triangulum is ~2.7m ly (2.5e19m) away.  That's an angular diameter of 2e9/2.5e19 or roughly 1e-10 radians.  Imagine a star this size in that galaxy.<p>A red blood cell has a diameter of ~8e-6m.  Pick up a mechanical pencil sitting around you with a .5mm lead in it.  Study the tip of that pencil and imagine 60 little red platelets lined up in a row fitting across its width.  Now pick up one of those little red blood cells and stick it to a window.  Then get in your car and drive 8e-6m/1e-10 or 86km away and look back across the (flat, obviously) Earth to that window.  As Triangulum rises over the horizon on the other side of our window, that little red blood cell would <i>fully eclipse</i> our remote twin of VY Canis Majoris.<p>I don't know if I'm seeing individual stars in that zoomable image, but if I am I don't understand how we make optics that good. (Caveat, Hubble's resolution is rated at ~2.4e-7 radians, so it's likely that those blobs aren't stars, or my math is off somewhere.)