Final answer:
A spaceship traveling from Earth to the Moon is similar to a planet orbiting the Sun because both are influenced by gravitational attraction, which is the principle force dictating their motion.
Step-by-step explanation:
A spaceship going from Earth to the Moon is similar to a planet orbiting the Sun in that B) Both experience gravitational attraction. This is a fundamental principle of orbital mechanics, where orbits are determined by the gravitational pull of larger celestial bodies, whether it's the Earth pulling on a spacecraft heading to the Moon or the Sun pulling on planets in the solar system. It's important to note that while both a spacecraft's trajectory to the Moon and a planet's orbit around the Sun are indeed elliptical (Elliptical paths), they do not necessarily travel at a constant speed and are influenced more by gravity than magnetic fields.
The Moon's orbit around Earth and the Earth's path around the Sun are not perfect circles but are slightly elliptical. According to Kepler's laws, an object in orbit will travel faster when it is closer to the body it is orbiting and slower when it is further away, negating the idea of constant speed. Moreover, the influence of magnetic fields is not the primary factor in the motion of planets or spacecrafts; rather, it's the gravitational attraction and the conservation of angular momentum that are key.