<b>Hubble Captured The Horsehead Nebula, 1990</b>; Astronomers used NASA's Hubble Space Telescope to photograph the iconic Horsehead Nebula in an infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24, 1990.
Astronomers using data from NASA's Hubble Space Telescope caught two clusters full of massive stars that may be in the early stages of merging. The 30 Doradus Nebula is 170,000 light-years from Earth. What at first was thought to be only one cluster in the core of the massive star-forming region 30 Doradus has been found to be a composite of two clusters that differ in age by about one million years.
These Are the Most Iconic Photos in Space Travel History