Encyclopedia of Outer Space vs Deep Space Science

Explore the universe, from stars and galaxies to space exploration. Read 434 articles, search for a topic, and save discoveries to revisit. START WITH FIVE FREE ARTICLES New readers can choose any five different articles. Your chosen articles stay unlocked, and revisiting them never uses another choice. Existing readers keep previously granted access. MAKE DISCOVERIES YOUR OWN • Search article titles and full text • Follow links between related topics • Save articles and return to your reading position • Continue recent reading and track your progress • Explore connections through the timeline and graph • Find article sources and image credits inside the app CHOOSE YOUR ACCESS Own the full encyclopedia with a one-time purchase for complete offline reading. Or choose monthly or annual Premium for the full encyclopedia plus AI chat grounded in this subject's articles. Eligible new Premium subscribers receive a three-day introductory trial. Subscriptions renew automatically unless canceled through your App Store account. Current local prices and terms appear before purchase. Restore Purchases recovers eligible previous purchases. Earlier full-version ownership includes encyclopedia and offline access; Premium AI requires a subscription. Internet access is required for AI chat and purchases. AI answers may contain errors; consult the linked sources. Article text is derived from Wikipedia. Images come from appropriately licensed Wikimedia Commons and other open sources. Source links, licenses and credits are available in the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Open Space brings the wonders of the universe to your fingertips. Powered by real NASA data, this beautifully designed app lets you explore space like never before. DAILY DISCOVERIES • Astronomy Picture of the Day - Stunning space imagery with expert explanations • Browse the complete APOD archive dating back years ASTEROID TRACKER • Monitor Near Earth Objects in real-time • See size comparisons and miss distances • Get details on potentially hazardous asteroids MARS ROVER GALLERY • Browse thousands of real photos from Curiosity & Perseverance • Filter by rover, camera, and Martian sol • Save your favorite images SPACE WEATHER • Track solar flares and geomagnetic storms • Aurora visibility forecasts • Coronal mass ejection alerts ISS TRACKER • Real-time International Space Station location • See exactly where it's orbiting right now PERSONALIZED EXPERIENCE • Dark & light themes • Metric or imperial units • Save favorites for quick access