Select a time span from the list below. 1500 - 1600 1600 - 1700 1800 - 1900 1920 - 1940 1950 - 1970 1970 - 1990 1990 - present Research astronomy during that time and create a timeline of important events. You may use several materials to create your timeline, including a roll of paper, construction paper, or the computer. Be sure your timeline is accurate, legible, and visually appealing. Choose the event you believe had the greatest impact and write a 150-word summary supporting your opinion.