instruction:
In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
question:
The hemisphere of the Earth experiencing daytime at any given instant changes continuously as the planet rotates on its own axis. The axis of the Earth's rotation is not perpendicular to the plane of its orbit around the Sun (which is parallel with the direction of sunlight), and so the length of the daytime period varies from one point on the planet to another. Additionally, since the axis of rotation is relatively fixed in comparison to the stars, it moves with respect to the Sun as the planet orbits the star. This creates seasonal variations in the length of the daytime period at most points on the planet's surface.
answer:
why only half of the earth can receive sunlight at any given time


question:
Navy command did not know of the ship's sinking until survivors were spotted three and a half days later. At 10: 25 on 2 August, a PV-1 Ventura flown by Lieutenant Wilbur 'Chuck' Gwinn and his copilot, Lieutenant Warren Colwell, spotted the men adrift while on a routine patrol flight. Gwinn immediately dropped a life raft and radio transmitter. All air and surface units capable of rescue operations were dispatched to the scene at once.
answer:
who rescued the survivors of the uss indianapolis


question:
Of the 15 teams that have never won the Super Bowl, four (4) are expansion franchises younger than the Super Bowl itself (Bengals, Panthers, Jaguars, and the Texans). The Falcons were enfranchised the season the Super Bowls began. The eight (8) other clubs (Cardinals, Lions, Eagles, Oilers / Titans, Chargers, Browns, Bills, and Vikings) all won an NFL or AFL championship prior to the AFL -- NFL merger; in the case of the Vikings, however, the Super Bowl existed at the time they won their league title, leaving them and the Falcons as the only two teams to have existed for as long as or longer than the Super Bowl and to have never secured the highest championship available to them. The longest drought since a championship of any kind is that of the Cardinals, at 69 seasons.
answer:

what team in the nfl has not won a superbowl