You might not know who these women are. But the world would be a different place without them.
Mary Somerville.
Mary Somerville translated many scientific texts and brought the achievements of her scientific contemporaries to a wider audience. Along with Caroline Herschel, Somerville was one of the first women members of the Royal Astronomical Society in 1835. The word "scientist" was coined in a review of one of her books, though it wasn't applied to Somerville herself.
Caroline Herschel
M. F. Tielemanm / en.wikipedia.org
The Sculptor Galaxy
ESO/J. Emerson/VISTA / eso.org