NGC 2170 is a reflection nebula located in the constellation Monoceros. Reflection nebulae are clouds of dust and gas that reflect the light of nearby stars, giving them a blue or blue-white appearance. NGC 2170 is illuminated by a group of hot, young stars located just outside the nebula. These stars are thought to be less than a few million years old, making them some of the youngest known in the Milky Way galaxy.