Astra Lost in Space 1-25
SHINOHARA Kenta new series after Sket Dance. This isn't running in Weekly Jump, but instead online I believe.
Quick summary: A group of 9 students are randomly selected to become part of a camping trip. At the start of the trip, something quickly goes wrong and becomes something like Star Trek: Voyager, stranded thousands of light years from home, they have to slowly trek back to Earth. Meanwhile, they realize they may be part of a larger conspiracy.
It's a good series, and features a lot of the humor that was in Sket Dance. It's also a lot more ecchi than Sket Dance ever was, just because all the characters are in skin tight suits and they play on that with each character. You can read weekly chapters on Viz's website for free.