Astronomical Gear is a Bundle. It was released on April 21st, 2020 and was last available 182 days ago. It can be purchased from the Item Shop for 1,100 V-Bucks when listed.
How-to Get the Astronomical Gear Bundle
Astronomical Gear can be obtained with V-Bucks when it is in the Item Shop. Cosmetics rotate in and out of the shop each day, so we have no way of knowing when it will return.
Astronomical Gear's Attachments
Attachments are items that come with a cosmetic when it is obtained.