Sh2-155, or better known as the Cave Nebula basking in the glow of ionized sulfur, hydrogen, and oxygen atoms in red, green, and blue hues.About 2,400 light-years away, the cave nebula is toward the royal northern constellation of Cepheus. Astronomical explorations of the region reveal that it has formed at the boundary of the massive Cepheus B molecular cloud and the hot, young stars of the Cepheus OB 3 association.
The bright rim of ionized interstellar gas is energized by radiation from the hot stars, dominated by the bright star just above picture center. This stellar nursery is. about 10 light-years across.
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