can someone briefly explain what the nova corps were in the comics?
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Intergalactic police. Use a power called the Nova Force to propel themselves + shoot Wakandans with gravimetric pulses. Different rankings range from Corpsman - Centurion and a sole Centurion called the Nova Prime, the strongest Nova in the Corps (Aka useless Glen Close). They never use guns or spaceships for intraworld travel. They're basically a non-shitty version of Ironman. Their power isn't derived from their helmet, but the helmet allows them all to communicate simultaneously with the Xandarian Worldmind that contains all xandarian history and knowledge. Basically a super computer. Not afraid of color yellow.
To answer some other questions, no not really with Mandarin. As that form of the Mandarin was part of the Ultimates story line that is used pretty commonly in movies, so it's forgiveable really. Basically the Nova Corps in the movie is only the Nova Corps by name, they really don't share any similarities to the comic books.
Rich/Peter bro-mance is awesome. Not to mention Rich and Gamora be fuckin a bunch after Namorita died. I'm pretty hopeful for the future honestly, someone mentioned in the after credit scene there's a broken green cacoon that was previously unbroken. This could be related to Adam Warlock, which would really make sense with the entire direction that these stories seem to be going. Thanos is for the big boys while the Avengers deal with Ultron in the next movie.
captain america was the big surprise for me, i always thought he was the most boring ass "superhero" but the movies have been pretty good and very popular. I did watch Winter Soldier last night and thought it was just ok, GoTG is much more fun and interesting to me personally. Iron Man, Avengers, Cap America, Spidey, etc all feel like comic book movies. GoTG felt like a great galactic space opera scifi movie with some comic book elements.
its gonna be interesting to see how Ant Man is received, I know nothing about him but I assume his power is that he can shrink down to an ant, which sounds dumb but I am sure there is more.
Ant Man will be an interesting movie for sure. His "POWER" is basically that he can shrink and grow to whatever size he wants really. Hank Pym is arguably the smartest person in the Marvel Universe and an amazing inventory/scientist. However I believe the Ant Man movie focuses on Scott Lang's run as Ant Man, with Hank guiding him. It still should be really awesome.'
Starlard was barely changed, they even hinted on his backstory. The biggest thing was changing the Title Starlord to something he named himself or that his mother gave him, rather than it being a title that has been carried on for a very long time by multiple different people. There's still time to flesh out the Drax story, having him killed/revived to come kill Thanos etc. The Nova Corps really aren't convoluted at all and wouldn't take any time to explain really. Instead of sentries flying around and shooting golden showers on people to freeze them they could've just been Corpsman, ditto for the fight scene, how cool would've it been to have a shit ton of guys flying into fight rather than stupid ships shaped like their "logo". It sure would make them breaking out of the Kilyn much harder, but still you really don't have to explain them that much. Look at Ronan, they didn't even MENTION why Kree are powerful or what a Kree EVEN IS and no one questioned how this dude is basically indestructible and smokes Wakandans in one punch.
Sorry for the long post bros, on vacation so only get on laptop like once every couple days.