Time is a measurement between events or moments. It is a measurement of progress of existence and events from past to future through present. Time is a fundamental part of the universe and it is a fundamental physical quantity. Time is referred to fourth dimension along 3 spatial dimension
The milky way is a galaxy which contains our solar system. Milky way contains a dim glowing band arching across the night sky, so it's name is 'milky'. Milky way is a barred spiral galaxy. It's diameter is approximately 1,00,000 - 1,20,000 light years long.
Kepler gives three scientific laws about the motion of the planets around the Sun. Kepler's law is the part of the Modern Astronomy and Physics. Johannes Kepler published his firs two laws in 1609 and his third law in 1619.
The earth, along with the sun and the remaining planets of our solar system, originated around 4.8 billion years ago from dust particles, which agglomerated gradually. At that time, the young earth was bombarded by countless meteorites from space.
The solar system is the gravitationally bound system where objects orbit arround the sun, directly or indirectly. Directly like the planets and indirectly like the moons.