Last January, I visited Arches National Park in Utah during the off-season. The snow on the red sandstone arches was breathtaking. Hiking to Delicate Arch was a highlight, but the return hike was scary due to the remote location and limited GPS signal. Witnessing the stars above Delicate Arch was special. The red loop in the photo is Barnard’s Loop within the Orion Constellation. It’s red because of hydrogen alpha gas, the most common gas (nebula) in the universe, which is invisible to the human eye but can be revealed with long exposures and specialized techniques.