The Galileo space probe has been a great source of information about space and space exploration. Space probes are sent into outer space to collect data on the solar system. At first, Galileo was intended to observe only one planet Jupiter and its moons. Galileo was initially supposed to be launched from a shuttle, with a powerful rocket boosting the probe into orbit. However, plans changed after the explosion of the space shuttle Challenger. The original trajectory of Galileo had to be changed because the booster rocket would no longer be carried by a shuttle. Galileo's new travel path relied on gravity assists from Earth and Venus to propel Galileo toward Jupiter. Then, after Galileo was already in orbit, its strongest antenna failed to open, and engineers had to rethink their plans again.