The author proposes extensions to the Scrum process model to add formal requirements and test case management, with requirements and test case work items that have their own state transition (e.g. âNot Implementedâ, âPartially Implementedâ, âFully Implementedâ).
In order to calculate the time of travel with this speed from Earth to Mars, we need to know the distance. When the Mars and the Earth are at the opposite sides of the Sun, the distance is the largest: approximately: 378 million km. The time needed for an electromagnetic wave to cover this distance is approximately: 21 minute. The closest distance between Mars and Earth is 78 million km, the time in this case is: 4.3 min.
Mars varies in its distance from the earth because neither planet moves at the same speed, and neither moves in an orbit that is exactly circular. The distance between the planets varies from 33,900,000 to 249,400,000 miles, quite a difference. The time required to reach Mars would depend, of course, on the speed of the rocket. Taking 17,000 mph as a not unreasonable average speed, the minimum time would be 33,900,000 / 17,000 = 1,994 hours = 83 days.