Top 10 planets factsPlanets quiz
This is the aurora of Jupiter. What are the visible bright spots caused by?
Jupiter moons. Jupiter's moons, especially Io (spot on the left), are powerful sources of auroras on Jupiter. These arise from electric currents along field lines, generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon.
Which of Saturn's moons has such distinctive equatorial ridge?
Iapetus. The ridge is 13 km high, 20 km wide and 1300 km long. Its origin is not known, but considering the amount of craters, it's safe to assume that it is a very old geological feature.
How many planets does the Solar System consist of?
Eight. These are Mercury, the Venus, the Earth, Mars, the Jupiter, the Saturn, the Uranus and the Neptune. The Pluto is excluded from the list since 2006, and it is classified as one of dwarf planets (not even the largest of them).
Mars colonisation is a hype topic. What is the biggest threat for those wishing to take a part in a journey to Mars?
Cosmic rays. The only efficient protection against high energetic cosmic radiation, one we are granted with, is Earth's magnetic field. Both during a long flight to Mars and through the stay on the planet, that did not form electromagnetic field, astronauts would be exposed to ionization.
The axis of rotation of this planet is tilted sideways, nearly into the plane of its solar orbit.
Uranus. Sometimes the Earth is close to the extension of its axis of rotation. Then it is possible to observe Uranus' moons revolve around the planet.
Which planet is this globe with such a bland look without any visible details?
Uranus. Upper parts of Uranus' atmosphere are composed of condensed hydrocarbons, mainly methane crystal particles. Contrary to the rest of gas giant planets, it's hard to observe clouds and storm bounds.
How long is stellar year on Mars?
687 Earth days. The Martian year is almost twice longer than Earth's year.