Planetariums contain astronomical items representing the Sun and the planets orbiting it (plus Pluto and Earth's moon).
Passive Collectibles [ | ]
Name
ID
Icon
Weight
Description
Jupiter
5.100. 594
+2 red Heart containers , -0.3 speed . Isaac builds speed while standing still, and releases poison gas clouds when he moves afterwards.
Luna
5.100. 589
Adds an extra Secret Room and Super Secret Room to each floor. Secret Rooms contain a beam of light that increases Fire Rate for the current floor and gives a Half Soul Heart .
Mars
5.100. 593
Dash by double-tapping the movement key, becoming invulnerable and damaging enemies. There's a short cooldown before Isaac can dash again.
Mercurius
5.100. 590
+0.4 speed . Doors stay open after entering a room, even in rooms with enemies.
Neptunus
5.100. 597
Isaac's mouth fills with tears over time while not firing, up to a cap. Holding the fire button will release all stored tears in rapid succession.
Pluto
5.100. 598
+0.7 tears . Significantly shrinks Isaac, allowing him to squeeze between objects and makes some enemy shots pass over him.
Saturnus
5.100. 595
Upon entering a room, a circle of tears orbits Isaac. Enemy tears have a chance to be caught in orbit, turning them friendly.
Sol
5.100. 588
Reveals the location of the Boss Room . Upon defeating a boss, activates XIX - The Sun damage and luck for the rest of the floor, and removes curses .
Terra
5.100. 592
+1 Damage . Replaces tears with rocks that deal variable damage, have increased knockback , and can destroy obstacles .
Uranus
5.100. 596
Isaac shoots ice tears, which slow enemies and freeze monsters they kill. Frozen enemies slide away and explode into ice shards when touched.
Venus
5.100. 591
Adds one red Heart container . Heals 1 additional Red Heart . Enemies near Isaac become charmed .
Planetariums contain astronomical items representing the Sun and the planets orbiting it (plus Pluto and Earth's moon).
Secret Room and 
Super Secret Room to each floor. Secret Rooms contain a beam of light that increases Fire Rate for the current floor and gives a 
Half Soul Heart.
Boss Room. Upon defeating a boss, activates 
XIX - The Sun, fully recharges Isaac's active item, grants bonus damage and luck for the rest of the floor, and removes curses.
Red Heart. Enemies near Isaac become charmed.
The Binding of Isaac: Rebirth
