Galileo wasn't the first to make a telescope but he discovered the telescope at the age of 46.
Galileo discovered stars by using the telescope?
Europa was discovered in 1610 by Galileo when he pointed a telescope at Jupiter.
The Amazon River was not discovered by Galileo using a telescope.
He discovered it on the moon.
Galileo discovered the telescope, and phases of the moon
He improved the telescope. discovered a moon with cravers.
He discovered that the earth was round not flat.
The Kepler spacecraft was launched on March 7, 2009 at 03:49:57 UTC aboard a Delta II rocket from Cape Canaveral.
Galileo
He discovered that interesting results could be obtained by using a telescope.
By 1609 Galileo had a telescope that magnified 20x
He discovered that Saturn has rings and he discovered Jupiter's four largest moons.