Do you know how many planets we have?
There were nine planets in our solar system. Which is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. The Pluto doesn't consider as a planet anymore because the Pluto is a dwarf planet.
How many moon in our Earth?
There is only 1 moon in our Earth which is sometimes called Luna but, in Mars there are 2 moons which is Phobos and Deimos.
How many countries use space exploration?
3 countries, which is America, China and Russia only use space exploration to monitor other countries' army and defence capabilities.