# Mars Lander revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Model: [Mars Lander](/models/mars-lander.md)

## Recorded posture

- First recorded event: 2026-06-07
- Last material change: 2026-06-07
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-06-07**: created (source: [{"url":"https://www.impulsespace.com/updates/impulse-space-and-relativity-space-announce-first-commercial-mission-to-mars","title":"Impulse Space and Relativity Space Announce Commercial Mission to Mars","sourceName":"Impulse Space (primary)"}]) (verified)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date. To restate a recorded change, write a new event through the updateEntityField chokepoint.

_Canonical URL: /models/mars-lander/history. REST: /v1/models/3a98969b-7cc5-482e-ad98-10fa747777c1/history. HTML: [/models/mars-lander/history](/models/mars-lander/history)._