The 47th chapter of Kenta Shinohara’s Astra Lost in Space manga has announced that the series will end with the 49th chapter on December 30, 2017.
The story of the manga is described as:
It’s the first day of Planet Camp, and Aries Spring couldn’t be more excited. She, along with eight other strangers, leave for Planet McPa for a weeklong excursion. Soon after they arrive, however, a mysterious orb appears and transports them into the depths of space, where they find an empty floating spaceship…
Shinohara launched Astra Lost in Space in May 2016 on Shueisha’s Shonen Jump+ app. VIZ Media began publishing the chapters in English online for free in August 2017.