This helmet-shaped cosmic cloud with wing-like appendages is popularly called Thor’s Helmet. Heroically sized even for a Norse god, Thor’s Helmet spans about 30 light-years across. In fact, the helmet […]

What happened next? Can you help @astro_paolo complete his #Halloween story in 140 characters? https://t.co/lKMY8RMdwY — ESA (@esa) October 31, 2017

How will #EuclidMission investigate #darkmatter #darkenergy observing galaxies & galaxy clusters? ➡️ https://t.co/dx8TSKYElK #DarkMatterDay pic.twitter.com/hlNk18OPzV — ESA Science (@esascience) October 31, 2017

Dark Matters afoot today #Halloween https://t.co/t4kxoqxtLK — ESA (@esa) October 31, 2017

Thing Addams paying us a visit for #Halloween! #VITAmission pic.twitter.com/HYUEoF7W1d — Paolo Nespoli (@astro_paolo) October 31, 2017

Here's the high-res of that image of #Cyprus by Sentinel-2A https://t.co/V8n4qCdzZr — ESA (@esa) October 31, 2017

Happy #Halloween! Are you busy #pumpkin carving? We found a very curiously shaped one: which #solarsystem object does it remind you of? 🎃🛰️🎃 pic.twitter.com/SFeqn60lOE — ESA Science (@esascience) October 31, […]

Всем веселого Хэллоуина с борта МКС! // Happy Halloween from the #ISS! Many thanks to @AstroKomrade for the photo and idea. pic.twitter.com/1gI8jEiqNJ — Сергей Рязанский (@SergeyISS) October 31, 2017

No-one on @Space_Station wanted to be the astronaut this #Halloween https://t.co/qEbTekQMwt pic.twitter.com/d7cxTnScIY — ESA (@esa) October 31, 2017

Arguably scarier than ghosts & goblins, the massive #Halloween crack in #Antarctica’s #BruntIceShelf near #HalleyVI: https://t.co/mM0UFzjPUT pic.twitter.com/4AkRli7kgw — ESA EarthObservation (@ESA_EO) October 31, 2017