The image, captured with his 20" reflector, revealed a clear spiral structure. But scientists at the time thought M31 was a nebula, a gas cloud in our galaxy. 🧪 🔭
Image: Isaac Roberts
The image, captured with his 20" reflector, revealed a clear spiral structure. But scientists at the time thought M31 was a nebula, a gas cloud in our galaxy. 🧪 🔭
Image: Isaac Roberts