Ad Astra Rocket Tiers and Planet Progression
Ad Astra's progression is a ladder of rocket tiers, each built from a better metal and each unlocking farther worlds. This guide maps the four rockets to the planets they reach.
The four rocket tiers
All rockets are assembled at the 
Nasa Workbench from a nose cone, six metal blocks, four fins, two tanks and an engine — the metal is what changes:
- Tier 1 Rocket —
Steel Block parts. Reaches the Moon. - Tier 2 Rocket —
Desh Block parts, using desh mined on the Moon. Reaches Mars. - Tier 3 Rocket —
Ostrum Block parts, using ostrum from Mars. Reaches Venus and Mercury. - Tier 4 Rocket —
Calorite Block parts, using calorite from the hot planets. Reaches a new solar system.
Planet by planet
The Moon is a barren, oxygen-free world whose value is underground, where you mine desh for the tier two rocket. Mars yields ostrum for stronger armor and machines. With enough ostrum behind you for a complete 
Netherite Space Suit and a third-tier rocket, Venus and Mercury open up, and calorite is waiting on both. Calorite then builds the ultimate tier four rocket, which leaves the solar system for Proxima Centauri — the current end of the progression.
Getting home
Always keep the means to return: open your lander, collect the rocket, fuel and launch pad, and carry them with every trip so you are never stranded off-world.
Suits have tiers as well
Reaching a planet is only half of it; the suit still has to survive what is waiting there.
- The plain
Space Suit is enough for the Moon. - The Netherite Space Suit takes four
Ostrum Plate, two 
Large Gas Tank, an 
Oxygen Gear and a 
Netherite Chestplate. It counts as both heat-resistant and freeze-resistant armour, which is exactly what the extreme worlds ask for. - The
Jet Suit closes the set, combining a Netherite Space Suit with a 
Calorite Plate, a 
Calorite Engine, a 
Calorite Tank and an 
Etrionic Capacitor.
The pattern is worth seeing: ostrum gates the tier three rocket and the suit that makes tier three survivable, and calorite does the same job one rung higher. Mining the metal is never the whole cost of a tier.