Where does “extrasolar” come from?

extrasolar (German) comes from German solar, from Latin sōlāris, from Latin -āris, from Latin -ālis, from Proto-Italic -ālis.

extrasolar (German): extrasolar

Definitions

Step	Language	Word	Meaning
1	German	solar	solar
2	Latin	sōlāris	—
3	Latin	-āris	—
4	Latin	-ālis	—
5	Proto-Italic	-ālis	—

extrasolar — Etymology, Origin & Word History | Etymology Explorer