Because Sometimes I'm A Five-Year Old

The thing in the top panel is what fell from space on page 1 of Domino: Hotshots #1. It's something almost certainly related to the Celestials, because the guy that touched it is now half a Jack Kirby character, and has that same weird pattern on his palm Arishem the Judge has.

I mean, that's Celestial poop, right? Probably not much, but I'm not crazy to think this? It doesn't look like any piece of their bodies that we normally see. The stuff fell from the sky, probably been floating through space for who knows how long, and lands in Antarctica. That scientist, Gavrie goes down into the crater to handle it while not wearing ever remotely sufficient PPE, and BAM! Space Hep A.

Now everyone is trying to catch this guy, not to quarantine him before he infects the entire world (and he's already gotten Outlaw), but because they think he has some great power their countries can exploit. He's talking about all these futures he can see, and things he can sense, and they think he has Cosmic Awareness. No, his mind is just being eaten alive by a virus strong enough to exist inside a Celestial.

Although maybe that's all Mar-Vell's Cosmic Awareness was. He came into contact with some stuff on a mission for the Kree and just had a different reaction to it. Both Earthlings and Kree got tampered with by the Celestials, but that doesn't mean they'd react the same way to exposure. Plus, they probably didn't get exposed the same way. You'd hope Mar-Vell would have been smart enough not to just walk up and handle glowy space crap.