In 1909, galileo first looked at the milky way using very powerful binoculars

Galileo first studied the Milky Way through his telescope in January, 1610 not 1909. Until his observations, the Milky Way was thought to be a band of wispy whitish clouds passing through the heavens. To Galileo's amazement, instead of seeing just a nebula (the Greek work for cloud) the milky wisps resolved into innumerable tiny stars, so crowded together that, without the aid of a telescope, the light from those stars simply blended together. 

Explanation:

False. Galileo died in 1642. In 1609, 300 years before your question's year, he was making a telescope. There were no binoculars in his time. He would have been gazing at the Milky Way then.

Galileo first studied the Milky Way through his telescope in January 1610. Until his comments, the Milky Way was conceived to be a band of wispy whitish clouds crawling within the heavens.

the answer is b ) square root of 5

show the wavelengths of a wave. show the crests of a wave.