About This Image
The arms of the "grand design" spiral galaxy M81 are filled with young, bluish, hot stars. The greenish regions in the image are bright, gaseous clouds where new stars are forming.
Scientific Significance
M81 is a benchmark galaxy for linking spiral structure, stellar populations, and distance calibration. Its resolved disk and group environment make it ideal for testing interaction-driven evolution.
Observation Details
Hubble captured M81 using high-resolution optical filters to map young blue stars, dust lanes, and older bulge populations in a single calibrated composite.
Location in the Universe
Constellation
Ursa Major
Distance from Earth
11.8 million light-years
Fun Facts
- 1
M81 is one of the best nearby examples of a grand-design spiral galaxy.
- 2
It belongs to an interacting group with M82 and NGC 3077.
- 3
Cepheid studies in M81 helped calibrate the extragalactic distance scale.
Image credit: NASA, ESA, Hubble Space Telescope
