Milestone | 2 |
Description | Small planets tend to be more dense. Hard surface, typical for smaller ones, can keep some substances (e.g. air, water) separated from the interior of a planet. Unfortunately, if a planet is too small, it may not provide enough gravity to keep the atmosphere and life forms. On the other hand, if a planet is too large, it can hardly be inhabited due to gravity holding the lighter elements like hydrogen and helium, thus making the planet unfriendly for life. |
Title | Build a planet! |
Action 1 | Build a Mercurian class planet Small is beautiful, they say. This planet may be small, but one can step on its surface which seems useful. However, is that enough? cost: e, e, Fe, Fe |
Action 2 | Build a Jovian class Gas Giant Here it is - more of a planet to love! Jovian class planets are huge, yet less dense than their Mercurian friends, so they may be created with less heavy elements. cost: e, H, H, H |
Action 3 | Not yet no cost |
Title | Light up the star |
Action 1 | What the F-star A life cycle of an F class star is quite short (just a few billion years), but it is abundant in hydrogen (H). Hydrogen may be useful later, but be careful - big stars may bring big troubles. cost: e, H, H |
Action 2 | It’s all K A life cycle of a K class star is very long (dozens of billion years), but it has a lower temperature so it may be a little harder to inhabit near planets. cost: e, H |