Oceans in hot water?
Science In Action
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How to Find a Star in a Galaxie Far Away From M101
The image is a few arc seconds across in terms of angle. I reckon that's about the width of a human hair held out at arms length. And within that, I don't know how many stars there are, but you sort of focus in on one or two, is that right? Yeah, that's right. Even though it's such a small angular distance, it's kind of a spectacularly large distance,. like the distance from the sun roughly to the closest star in our own galaxy, Proxima Centauri. So we're dealing with huge distances, but very small scales on the images. We have to use very precise, it's called astrometry, or just measuring
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