The Next Blue Dot

摘要

In 1990, at the request of Carl Sagan, NASA engineers turned Voyager 1 toward the inner solar system and com- manded its telephoto camera to take a picture of Earth from a distance of 61/2 billion kilometers (4 billion miles). This produced the famous "pale blue dot" image of our home planet, which Sagan likened to "a mote of dust suspended in a sunbeam."