The Hubble space telescope Orbitz 353 miles above earth and earth’s radius is about 3960 miles which is closest to the distance from the telescope to earths horizon

Answer 1

Adding th telescope's distance above the earth, 353, to the radius of the earth, 3960, drawing a line to the horizon which is perpendicular to the horizon line, creates a right triangle when you draw a line from the center of the earth to the horizon point.

Then that distance X = √(4313² - 3960² ) = 1708.9 miles