Cosmic Voyages
Cosmic Voyages are a unique feature of the mod, allowing the player to visit various mini-Dungeons, also known as subworlds, which help the player gather various resources, including 
Prismatic Cores, 
Banded Tenebrium and 
Inert Shards.
Cosmic Voyages can be accessed after interacting with the player's Starfarer once King Slime has been defeated.
Upon entering any subworld, the player will be affected with the Cosmic Voyager debuff, restricting them from using Wings, Mounts, Explosives, the 
Rod of Discord as well as disallowing any interaction with blocks. Some subworlds apply additional effects.
Mini-Dungeons
Before Stellaglyph
These mini-dungeons can be accessed without a Stellaglyph.
Observatory Hyperborea
"One of the many observatories dotting the Moirae Galaxy- and one your Starfarer calls home.
Each Observatory is home to a magical conduit called a 
Celestriad Root."
Stellaglyph (Tier 1)
These mini-dungeons require a 
Stellaglyph (Tier 1) or higher tier of stellaglyph to access.
Cygnus Asteroid Field
"A collection of marble asteroids, notable for their strange foreign ruins- possibly a clue to their original inhabitants, yet the passage of time has rendered archeology impossible."
Source of Prismatic Cores.
Mining Station Aries
"A long-abandoned mining station positioned on the hollowed-out husk of a forgotten planet. Sights like this are common the further away you stray from the galaxy's center."
Source of Prismatic Cores.
Stellaglyph (Tier 2)
These mini-dungeons require a 
Stellaglyph (Tier 2) or higher tier of stellaglyph to access.
Caelum
"It is unknown what sapped this planet of life, but it exists now as a shell of its former self: a chalky white lonely world. Only a small portion of the surface is traversable: the rest crumbles at any touch."
Source of Inert Shards.
Corvus
"Deep within the Ardor, dwindling resources led to this ruined, war-torn ashen planet. A grim reminder that while war could kill you, the cold will. While its citizens are long gone, lawless raiders roam the ruins."
Yojimbo can be found wandering the ruins. He will give information about the state of the galaxy.
Source of Banded Tenebrium.
Pyxis
"A tiny mana-concentrated region of space. Closer inspection reveals what seems to be a man-made structure, both rudimentary and stunningly innovative."
A passive world where Garridine resides. She will inquire for various items from the player's gameplay in return for Stellar Foci.
The items she requires are as follows:
Scorpius
"A moon long abandoned by its home star covered in eerie Crimson. It is unknown whether this celestial body is related to the blood moon phenomenon at this time."
Source of Crimson Enemy Drops.
Serpens
"A strange, foreign mass drifting in space. Whole it appears stable, evidence suggests the entire celestial body is one giant Corrupted organism, perhaps once a part of a leviathan-class entity."
Source of Corruption Enemy Drops.
Tucana
"The selfsame supermassive star providing succor to your home planet has also graced this one- perhaps a bit too much. Below the lush overgrowth layer lies the cerulean undergrowth."
Source of Jungle Enemy Drops.
Celestia
"A collection of well-preserved, brilliant structures bound by mystic energy, once in service of a powerful figure, albeit lost to time. Contributed by: Izanagi, The wanderer of stars"
Source of Prismatic Cores.
Ultra Plant
"A unknown locale populated with strange figures both inert and living. The constant bursts of electricity provides a hostile evironment to traverse and explore. Contributed by: Hockerzocker"
Chests have a small chance to contain the 
Electric Guitar Pick.
Stellaglyph (Tier 3)
These mini-dungeons require a 
Stellaglyph (Tier 3) to access.
Fallen Theranhad
"A floating archipelago left abandoned after its emperor became the vessel to a malevolent cosmic deity. A dark energy permeates the air. Contributed by: hakomari"
Source of Prismatic Cores.
Faint Archives
"A strange, pristine locale sitting utop a cloudy expanse. The walls are home to myriad secrets and mysteries, some which threaten to come apart at the seams. Contributed by: UnkownSToast"
Chests have a rare chance to contain the 
Fragment of Lost Memory.
The Dreaming City
"A majestic stronghold once populated by a long forgotten race. It is plagued by hostile entites suffused with paracausal darkness, and is oft drifting between another plane of existence. Contributed by: Tatriskel"
Source of 
Stellar Remnants. Staying on the planet will teleport the player to Katabasis, where Arbitration spawns.
Lyra
"A strange planet known as Anomaly Iota. It is recorded emitting strange, powerful vibrations periodically akin to a beating heart. Exploration is limited due to a highly acidic surface."
Source of Prismatic Cores. Staying on the planet will teleport the player to Katabasis, where Arbitration spawns.
Currently Inaccessible
These mini-dungeons have no way to access them yet.
Aquarius
"An ocean planet covered entirely in water. While it does not sustain intelligent life, the geothermal conduction beneath the waves means some life can still persist, even deep within the Ardor."
Antlia
"A colossal gas giant with no surface. Even close proximity would mean instant death due to the overwhelming force of it's gravity."
Trivia
- Although placing tile is intended to be forbidden, there are some flaws in current 1.4.3.6 version, allowing the player to place and remove wire and actuators, and to create tombstones after death.
- Also, prevention of explosion results in conflict with certain map design. In Corvus, there are a group of chests requiring the player to trigger a series of explosives and break the floor and ceiling of the building. However, that explosion is prevented from breaking the tiles, and thus the chest can't be accessed by intended puzzle.
- However, combining the two features, the Corvus explosive puzzle can be solved by setting up wires and actuators and de-actuate the tiles.
- Despite Clentaminator usage being banned in subworlds, usage of the Terraformer is not restricted.
- Although the Rod of Discord cannot be used in subworlds, using the Pearlescent Orb to teleport still works.