Glowsticks are an illumination item in Astroneer that can be crafted via the Backpack. They offer dim illumination and last for 15 minutes before disappearing, but are very cheap to make with only a single Organic. Each stack provides 25 individual Glowsticks which can be placed. When a Glowstick is placed, one will visually disappear from the stack item, making it easy to tell how many Glowsticks are left in that stack, in much the same way as Tethers.
Glowsticks are used for quick and easy light sources early on in the game. They may be placed either from the widget slot in the Backpack with use of context keys, (for PC: or , Xbox: or , PS4: or , Switch: or ) or by placing the bundle on the ground and pressing (PC: , Xbox: , PS4: , Switch: ) to drop one and then move and drag.
Glowsticks last for 15 minutes and blink rapidly before disappearing.
Glowsticks
Backpack
Organic
Glowsticks
or 
, Xbox: 
or 
, PS4: 
or 
, Switch: 
or 
) or by placing the bundle on the ground and pressing (PC: 
, Xbox: 
, PS4: 
, Switch: 
) to drop one and then move and drag.
A Single Glowstick