As you know, Space Shuttle Atlantis is scheduled for lift-off from Kennedy Space Center today, July 8, at 11:26am Eastern (carrying two modified iPhone 4s with it). This will be a historic launch marking the 135th and final mission of the Space Shuttle fleet. Time to refresh your astronomy knowledge, don’t you think. Just in time, NASA’s official app which has been downloaded five million times on iPhone and iPad is now available on Android Market.

The 4MB download works with Android 2.1 onwards. It’s your window to an enormous collection of NASA content that spawns hires space imagery, on-demand videos, live streaming video from NASA Television, mission information, feature stories and breaking news. It also lets you locate sighting opportunities for the International Space Station and track the current positions of spacecraft currently orbiting Earth. More features and screenies after the break.

Features include:

• thousands of images from NASA IOTD, APOD and NASAImages.org

• on demand NASA Videos from around the agency

• current NASA Mission Information

• launch Information & Countdown clocks

• current Visible Passes for the International Space Station (ISS)

• ISS and Earth Orbiting Satellite Tracker

• NASA Twitter Feeds from around the agency

• news and Features from the NASA topic areas

• Facebook Connect and Integrated Twitter client for easy sharing

• Live Streaming of NASA TV

• NASA TV and What’s On Your TV schedules

• map and links to all of the NASA centers

• featured content section

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