Astronomy

Pluto.

Eight.

c) Gus Grissom.

Lunar International Observer Network.

Iridium The Iridium satellite constellation is a system of 66 active communication satellites and spares around the Earth. It allows worldwide voice and data communications using handheld devices. The Iridium network is unique in that it covers the whole earth, including poles, oceans and airways, however the service is interdicted due to American embargoes in North Korea, Iran, Libya and Sudan. The name was taken from the element Iridium, with the atomic number of 77 — the size of the satellite constellation projected in the early stages of planning.

Christa McAuliffe.

Project Mercury.

Hubble.

Saturn

Saturn