Millennium Astronomyさんのイラストまとめ

The Rosette Nebula is visible with binoculars towards the constellation of the Unicorn (Monoceros).

The North America Nebula: a vivid 20 light-year long emission nebula lying approximately 1,500 LYs away.

The Carina Nebula spans 300 LYs lying 7,500 LYs distant. These clouds are "much less" dense than Earth's atmosphere.

Towards the center of The Keyhole & Carina nebulas Eta Carinae was once one of the brightest stars in the night sky.

The Western Veil Nebula, 1500 LYs away. The Veil Nebula is 70 LYs long, but this image covers half that distance.

M51: The Whirlpool Galaxy. Even at 31 million LYs away you can still see faint tidal debris from it's companion.

Melotte 15: 7,500 LYs away in the Heart Nebula. The colorful region has dark clouds, &are silhouetted on atomic gas.

Open cluster IC2944 (6,000 LYs distant in Centaurus) is a giant molecular cloud where thousands of stars are born.

The Carina Nebula spans 300 LYs lying 7,500 LYs distant. These clouds are "much less" dense than Earth's atmosphere.

The central ring of the Helix Nebula is about a light-year across. Our Sun could create something similar.