To begin with, why is it Captain "Rocket" instead of Captain Rocket? In one story they even spell it that way in the balloons, which must have been a pain for the letterer. They should just say, "better known as Captain Rocket" and leave it at that.
To start with "Grave of the Rocketeers:" odd that the writers of this comic equate the stratosphere with outer space. I've always been a fan of the stratosphere. During the 1920s and 1930s, the heyday of airplanes, the stratosphere was mysterious and romantic. By the 1950s when this comic appeared the luster had worn off and space was the place for adventure. Anyway, I love the s-f gobbledygook. Didn't they use a probeoscope for my colonoscopy? The stilted, expository dialogue sounds like parody dialogue from a Bob and Ray skit. Captain Rocket is something of a jerk: "Argo, no one questions my calculations." The story itself is nothing special. The artwork isn't bad. There's a Jay Disbrow vibe to some of the faces, but the figures aren't stiff enough. Note: in the future, off-duty spacemen will wear labels on their clothes identifying their ship and their position. It's so the cops know where to dump them after they pass out at the Jet Trailers Cafe.
The same artist seems to have drawn the "Monsteroids" story. A brief moment of confusion arises when he makes the Terran Borer and the Projecto-turret look similar (and the colorist followed suit). Studies show Gorgo's Black Bubbles prefer cute babes to men four-to-one. Clever guy, that Captain, but not clever enough to made his belt invisible along with the rest of him. Shoot at the belt, monsteroid idiots! Unfortunately, all the converted humans--not to mention the not-yet-converted humans--die when the gas explodes. Well done, Captain Rocket.
"Pirate of the Stratosphere" is ridiculous in trying to equate deep sea diving and "deep space" diving. There should be limits even to pseudo-science. The artwork is very nice. His costume design (for the men, anyway) isn't so hot, though.
"Aurora of Jupiter" gets points for its non-Kirby Kirby monster. More points for the cigar-chomping alien. But if the lizardons are projections, how come all those buildings burn and explode? Best line: "Are we to surrender to these fiend-like dogs?"
The combination of silliness and good art makes this a hit for me. Well, farewell--I am off to Jupiter.