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The Cave Nebula in Hydrogen, Oxygen, and Sulfur What's inside this cosmic cave? A stellar nursery 10 light-years deep. The featured skyscape is dominated by dusty Sh2-155 , the Cave Nebula. In the telescopic image, data taken through a narrowband filters tracks the nebular glow of hydrogen , oxygen , and sulfur , colors that together form the Hubble Palette . About 2,400 light-year s away, the scene lies along the plane of our Milky Way Galaxy toward the royal northern constellation of Cepheus . Astronomical explorations o f 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 hydrogen gas is energized by radiation from the hot stars, dominated by the bright star just to the left of the cave entrance. Radiation driven ionization front s are likely trigger...

Space Some serious space weather at play. On that day in 1972, over the course of 30 seconds, American troops flying near North Vietnam witnessed between 20 and 25 explosions in the water. via Popular Science "https://ift.tt/2z7gq1Y"

Technology Ever wonder why many Instagram photos look the same? The answer is presets. Make your own photo editing presets and sell them if you're already famous. via Popular Science "https://ift.tt/2QGhuAL"

Gift Guides You're sure to please with these. The annual office gift exchange is here, and you have no clue what to buy. Don't panic—these gifts are sure to please your coworker without breaking the bank. via Popular Science "https://ift.tt/2kcpXg1"

Health Only one kind of mask can truly protect you from the smoke. As wildfires ravage large sections of both Northern and Southern California, smoke continues to grow and blow into residential neighborhoods, parks, and cities. In both… via Popular Science "https://ift.tt/2B4epFe"

Gadgets Design tweaks aside, the EOS-R is an impressive camera. Sample images and hands-on impressions with a landmark camera… via Popular Science "https://ift.tt/2ROUJdS"

Today's Deal: Save 70% on This War of Mine !* Look for the deals each day on the front page of Steam. Or follow us on twitter or Facebook for instant notifications wherever you are! *Offer ends Monday at 10AM Pacific Time via Steam RSS News Feed "https://ift.tt/2B4szpK"

Environment It's a lot. Most of California’s hottest fires have burned since 2000—13 out of 20 total—as higher temperatures have made wildfires increasingly likely and destructive. via Popular Science "https://ift.tt/2Mafulj"

Environment Despite accusations, the state has excellent manage policies—it's just also built to burn. Though the legacy of America's old fire suppression strategy resulted in the buildup of excess flammable brush, there are two other key reasons why California is the… via Popular Science "https://ift.tt/2FthwuK"