The telescope wasn't invented until about 1604, so "early" astronomers had no telescopes.
The big limitation was a lack of telescopes.
Yes, both of them. And they also use reflecting telescopes.
Their eyes, ground-based telescopes, space telescopes.
Telescopes
No they do not, or use gamma ray telescopes either. Not ground based.
We use telescopes or satellites
they use space probes,satellites,and of coarse,telescopes.
Astronomers can use their eyes to study the stars. They can also use various telescopes that either refract, reflect, and detect exotic formations.
TELESCOPES
Type your answer here... telescopes answered by Jacob welborn
Its simple! They use telescopes instead!
to get every view