Cosmic Car Key

Type	Mount summon
Use time	20 (Very fast)
Tooltip	Summons a rideable UFO mount
Rarity
Sell	5
Research	1 required
Buff	UFO Mount
Buff tooltip	It's a good thing you had a MAC
Use	https://terraria.wiki.gg/wiki/File:Item_25.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Cosmic Car Key is a Hardmode mount-summoning item. When used, it summons a rideable UFO that allows the player to fly and hover indefinitely. It has a 16.67*1/6 (16.67%) chance to be dropped by the Martian Saucer mini-boss during the Martian Madness event.

Notes

The UFO mount does not work in liquids. When attempting to fly through them, the player will automatically be dismounted.
The mount has a top speed of 41 mph when flying up/down or east/west. When flying diagonally, however, it can reach 58 mph max.
- Because of this, one can fly at the same speed as, if not faster, than the Dungeon Guardian (41 mph consistently).
When ascending the UFO, it can travel upwards through a one block gap while also moving east or west.
The UFO cannot fly downwards through "bottom" platforms (that is, hammered to the lower half of the block), and will instead bounce off them. Other platforms can be passed downward with only a slight delay.
Falling from maximum speed and mounting the UFO allows it to fly at 51 mph.
- Similarly, it is possible to fall from a height at max speed and then mount the UFO and fly diagonally. This reaches a speed of 66 mph.

Achievements

The Cavalry • “Equip a mount.”

Equip your first mount.

Tips

When using this mount, it may be useful to replace other mobility accessories such as any Wings or Boots with damage- or defense-based accessories.
While they lack infinite flight time (unless the Soaring Insignia is used), using wings with hovering abilities in tandem with Lightning/Frostspark/Terraspark Boots can provide more speed and mobility.
Using wings with a fast ascent speed such as Jetpack, it is possible to fly upwards with the wings, deploy the mount and maintain the speed of the wings beyond the duration of the wings.
Using the Rod of Discord can be a great way to travel while using this mount, as you can teleport through tight areas rather than dismounting the UFO.
It's possible to give this mount to another player while mounted and still keep using the UFO.
The mobility of this mount and the ability to use items while riding it make it a good mount for construction.
If one needs to have an infinite flight mount underwater, the Cute Fishron Mount or the Witch's Broom are good replacements for the UFO.
This mount may not be the best to use in an arena for intense boss fights (such as the Empress of Lightand Moon Lord), as its infinite flight time is overshadowed by its not very fast speed, lack of dashing ability, and slow turning speed. It may be preferable to use the Cute Fishron with Honey and Water bubbles (which has a very fast speed along with boosting damage by 15% when in and shortly after leaving liquids) or to not use mounts at all and instead have the Soaring Insignia, the Expert mode-exclusive drop from the Empress of Light, which provides infinite flight time.

Trivia

The buff tooltip is a reference to the film Independence Day, in which a Macintosh computer is used against an alien spaceship.
The name of the item might be a reference to a line in a rant about the insanity of everyday life by Eric T. Duckman from season 3, episode 6 "A Room with a Bellevue" from the American adult animated sitcom Duckman. The line goes, "...knowing when it's time to flash the cosmic car key at those Pearly Gates, I won't be in the coffin anyway...".

History

Desktop version

Desktop 1.4.0.1:
- Increased drop rate.
- Worms and teleporting enemies will no longer spawn if the player stays still in the UFO for 5 or more seconds.

Desktop 1.3.0.6:
- Fixed 'allow mounting' check not taking player's velocity into account (mounting into ceiling exploit)
- Fixed issue where Shroomite armor and Psycho Knife stealth would work on mounts.