Sun-centered model, a theory that the Sun is at the center of the Universe, orbitt, a complete revolution around a body in space, like a star or a planet, Earth-centered model, a theory that all planets, stars and moons revolve around Earth, orbital period, the time it takes to complete one full revolution around a body in space, kepler , was a German astronomer who worked as Brahe’s assistant at the turn of the 17th century..

द्वारा

लीडरबोर्ड

दृश्य शैली

विकल्प

टेम्पलेट स्विच करें

)
ऑटो-सेव पुनःस्थापित करें: ?