[csallen]

Anything can be compared. In fact, you may be surprised to learn that the entire point of the word "compare" is to point out similarities between otherwise dissimilar things.

[marchingkazoo]

Well, yes, it's true that the Milky Way could be compared to a sardine sandwich. As has been noted, that comparison would be disingenuous.

[csallen]

Both the Milky Way and sardine sandwiches are visible objects.

That's a comparison that's not disingenuous.

If you're going to label a comparison as disingenuous, the onus is on you to provide a reason why. Otherwise, you're being unreasonable.

[marchingkazoo]

>Both the Milky Way and sardine sandwiches are visible objects.

Sure. Aside from that? I'm trying very very hard to not be pedantic, but you are making that difficult. Thing is, comparing incompatible items is disingenuous.