As in gymnosperms, the ovule becomes a seed, encasing the embryo and endosperm in a seed coat. But unlike gymnosperms, in angiosperms the ovary containing the ovules develops into a fruit after fertilization.
Captain James Cook was the first to cross the Antarctic Circle, doing so in 1773. However, pack ice and the freezing of his ship's sails prevented him from reaching the Antarctic continent itself. The same thing happened when he again crossed the Antarctic Circle a year later.
Herschel measured the axial tilt of Mars and discovered that the martian ice caps, first observed by Giovanni Domenico Cassini (1666) and Christiaan Huygens (1672), changed size with that planet's seasons. It has been suggested that Herschel might have discovered rings around Uranus.