Orion Nebula & Andromeda Galaxy
Orion Nebula
- one of the brightest emmision nebulae, and is visible to the naked eye in the night sky
- closest region of massive star formation to Earth
- 24 light years across
- mass of 2000 times that of the Sun
Andromeda Galaxy
- a spiral galaxy approximately 2.5 million light-years (2.4×1019 km) from Earth
- in the Andromeda constellation
- Also known as Messier 31, M31, or NGC 224
- The Andromeda Galaxy is the nearest spiral galaxy to our Milky Way galaxy, but not the closest galaxy overall.