|____ discovered Jupiter's four largest moons in 1610.
|The ____ comet can be seen about every 75 years.
|The Sun is one of the 100-400 billion stars in the ____ galaxy.
|William ____ discovered Uranus using a telescope in 1781.
|The ____ is an asterism in the Ursa Major constellation.
|Polaris is the brightest star in the ____ constellation.
|Clyde Tombaugh discovered the dwarf planet ____ in 1930.
|The ____ Space Telescope was launched in 2021.