SpaceCorp: 2025-2300AD

Yes — you may declare use of all matching Infra on any one HQ (yours or an opponent's); if you use an opponent's Infra that opponent receives a reward, and opponents' Infra or bases cannot be used once the end of an era is triggered (pages 6, 7, 13).

No — a tile is eligible for Produce if it has a P# and you have any type of base there; a team need not be present to collect profit (page 12).

Calculate Move by counting 1 to lift off, add the cost of any region borders crossed (the diamond values), add 1 to land at the destination, and include any gravity penalty for the start or end site (penalties are cumulative); Mars and the Asteroid Belt have special rules noted on the board (page 9).

No — you may only declare a Research action when you have seven or fewer cards in hand, though there is no upper hand-size limit so Research can leave you with more than seven after resolving (page 8).

Yes — exploring places the Discovery tile and your team atop it to indicate your claim, which lasts only while that team remains; if an opponent builds a base on a site you claimed, the exploring player gains 2F as recompense (pages 10–11).