As we discussed previously, the Milky Way is a collection of stars, gas, and dust that is roughly circular yet also thin and flat, shaped like a pizza or a frisbee.
(we; discussed; T:previously) (the Milky Way; is; a collection of stars, gas, and dust that is roughly circular yet also thin and flat, shaped like a pizza or a frisbee) (a collection of stars, gas, and dust; is; roughly circular yet also thin and flat, shaped like a pizza or a frisbee)
we the Milky Way a collection of stars, gas, and dust
discussed is is
T:previously
a collection of stars, gas, and dust that is roughly circular yet also thin and flat, shaped like a pizza or a frisbee
roughly circular yet also thin and flat, shaped like a pizza or a frisbee