Deep Dark Galaxy - Bubble Blastoff

Welcome to the Galaxy!
Mario
We land in the galaxy to find the cannon taken over by a Monty Mole in a water-blasting turret. The Toad Bridgade is hiding behind umbrellas. Red Toad says, "That Undergrunt Gunner is keeping us from exploring the area!" To reach him, we must backflip onto the turret and pound it. After the second hit, we have to deal with rapid fire from the turret. The third hit will make it explode. This will give us access to the cannon. The gate to the pool is open and there are three unlit torches this time. On my first playthrough, I did not realize that there were three torches, and only lit two with the Fire Flower from the planet with the pink Octoombas. I knew something was supposed to happen (lighting all three gives us an Ice Flower so we can progress), so I hopped in the cannon once more and aimed at the water blasters I saw in the opening cutscenes. I missed a lot, but eventually aimed correctly and landed in front of a water blaster that took me to the next part of the level. I do not recommend this method, but it can be done. Once we get the Ice Flower, we skate over the pool to the poles with water sprayers that we can freeze. We use these to reach more poles to a grassy area. We follow the grass around to a blue star disc floating in midair. Its ? Coin makes 5 Sling Stars. They will take us to the edge of the pool, high on the rock formations. We go to the right until we find the water blaster.
The water bubble will take us to the next planet, which has bouncing Cheep-Cheep. (The water there is too shallow for them). There are stumps on the planet we must pound to activate the water blaster, which takes us to a large spherical planet made of glass and filled with water. There are giant tennis balls rolling around inside, a watermelon at the center, and a laser firing laser rings over the planet's surface. We see a dancing Blue Toad, who says, "There's a Power Star hidden inside that watermelon! Use ground pounds to make those tennis balls hit that watermelon to get that Power Star." Now that we know what to do, we line ourselves with the path of the tennis balls and pound them when they're underfoot. We pound all three in, the watermelon expanding with each hit. Once the third one hits, the watermelon expands to the point that the glass breaks and the Star appears from the fruit. The laser is still firing, so get the Star quickly.
Star Get #87, 11 Coins, 1898 Star Bits, 20 Lives

Luigi
We land in the galaxy and pound the turret to open the cannon. We get the Rainbow Star and the Fire Flower and return to the beach to light the three torches for the Ice Flower. We climb the water sprayers and backflip and spin to the water blasters. We blastoff twice, stopping on the planet with the Cheep-Cheep to pound the stumps. We pound the tennis balls into the watermelon for the Star.
Star Get #87, 6 Coins, 2072 Star Bits, 31 Lives