Solar System

금성의 시운동 Apparent Motion of Venus

Apparent Motion of Venus

All planets in the Solar System revolve around the Sun in a counterclockwise direction when one views them from the north pole of the celestial sphere. Mercury and Venus are inner planets in the Solar System. They are closer to…
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금성의 위상 Phase of Venus

Phase of Venus

What is the difference between Geocentric theory and Copernican theory? What is the phase of Venus, which can not be found in the Geocentric theory?

태양계의 규모 Scale of Solar System

Scale of Solar System

Click the button to move to the planet you want. Is it closer than you think? If not, why?

갈릴레이 위성 Galilean Moons

Galilean Moons

Jupiter, the largest planet in the solar system, has many satellites. Jupiter’s representative satellites include Io, Europa, Ganymede, and Calisto. These four satellites are called Galilean satellites. Galileo observed that these satellites revolve around Jupiter through continuous observation.