The planet Venus spins opposite to the other planets in the
The Sun contains 99.8 percent of the total mass of the solar
Saturn has the greatest number of known moons of any planet
in the solar system.
It is impossible for a solar eclipse to last more than 8
A galactic year is 250 million Earth-years.
A quasar generates 100 times as much light as the whole of
our galaxy in a space not much larger than our solar system.
The solar system consists of the Sun, nine planets and all
their moons, and several thousand asteroids and comets.
All the planets in our solar system could be placed inside
the planet Jupiter.
The sun was formed from a cloud of hydrogen mixed with small
amounts of other substances that had been produced in the
bodies of other stars before the Sun was born.