400 years of astronomy
Definition:
The 400 years of astronomy is the time since 1609 when scientists began using telescopes to study space and made many important discoveries about planets, stars, and galaxies.
Key Points:
Telescopes began being used in 1609 by Galileo Galilei
The heliocentric model was accepted
Planets move in elliptical orbits.
Discovery of galaxies beyond the Milky Way.
Humans landed on the Moon in 1969.
What happened in these 400 years?
Telescope discoveries
Galileo saw moons around Jupiter
He observed phases of Venus
This supported the heliocentric model.
Heliocentric model accepted
Nicolaus Copernicus first proposed it.
Johannes Kepler explained that planets move in elliptical orbits.
Modern discoveries
Discovery of galaxies beyond the Milky Way
Humans landed on the Moon in 1969
Powerful space telescopes like Hubble Space Telescope
Fun Fact:
The universe is still expanding today.