Ember Twin

Ember Twin is one of the Hourglass Twins, and, like its sibling, it is rather small and the closest planet to the sun along with Ash Twin.

Overview
Ember Twin is a reddish, mostly barren planet evocative of Mars or the deserts of the American Southwest. Marked by high plateaus and deep canyons, the rocky sphere is also riddled with winding caves and the occasional cactus patch.

Besides the more mundane geography, a deep canyon cuts through the planet's equator down to the core. This striking geological feature fills with sand as Ash Twin deposits the entirety of the sand (or "ash") covering its surface at the start of each loop.

As the player will learn, the interplanetary sand normally falls back to the Ash Twin after filling Ember's canyons and caves, but, during the game's time loop, the sand will only fall from Ash to Ember.

Gravity Cannon
The Gravity Cannon on Ember Twin, like others of its kind, is a warp/launch point for Nomai shuttles. The cannon is embedded into one of the outer walls of the Sunless City caves; unfortunately the door to the primary entrance is blocked by cacti.

Escape Pod 2
A Nomai escape pod may be found on the planet's surface. The ship may be located using the Signalscope to follow the haunting siren of the Distress Signal, which also emits a purple-blue pillar of light. The player may enter the pod, as well as find multiple recordings and written records left behind by the ship's former owners.

Quantum Moon Locator
The Quantum Moon locator is the Nomai's second attempt at a device that can track the Quantum Moon. Stone markers aligned with each planet slide along a circular track as the respective planets orbit the sun. However, the marker with the Quantum Moon's symbol spins wildly. Writings near the device detail the ancient researchers' findings.

Chert
Chert is one of the other Outer Wilds explorers; their instrument is the drum. They give you hints about other interesting places on Ember Twin and tells you about their experiences and more.

Sunless City
The Sunless City is a large underground settlement built into the cave systems by the Nomai to protect its inhabitants from the harsh solar radiation and heat on the planet's surface. There are few entrances to the city's ruins, and all paths require navigating dark, twisting subterranean tunnels as the planet's cave systems fill with sand. Along the winding cave routes, other discoveries may be found, as well.

High Energy Lab
The lab is referenced in many Nomai writings scattered around the solar system. It holds key information regarding the Nomai's warp discoveries and subsequent scientific endeavors. The lab is very difficult to reach, as most the former primary entrances are inaccessible. For the player, the only entrance is at the lowest levels of the Sunless City.