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In his early career:

No telescopes.

A log to track planets.

Sea-faring devices such as the sextant

Later in life:

In 1609 Galileo started using the telescope on the 'heavens'

Kepler used the Galilean telescope until 1611 he re-invented the refracting telescope (now known as the Keplerian telescope)

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13y ago
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12y ago

he did not use telescope because it was not invented yet

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12y ago

a telescope

or

other space units that can shoot off of Earth by rocket

:D

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9y ago

Newton used a refracting telescope and calculus to map the orbits of planets and satellites.

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16y ago

a telescope

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10y ago

Telescope

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Q: What tool did Galileo use to discover things about space?
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