An app that let you explore NASA data.
NASA gathers a lot of data that are free to the public.
By using NASA’s application programming interfaces (APIs), with explora users can access this public informations.

Explora implements some of the API's :
- Astronomy Picture Of The Day (APOD).
Astronomy Picture of the Day is a website provided by NASA and Michigan Technological University. According to the website, "Each day a different image or photograph of our universe is featured, along with a brief explanation written by a professional astronomer."

- Earth Polychromatic Imaging Camera (EPIC): Full disc imagery of the Earth.
See images of the entire sunlit side of Earth, and watch time-lapse videos of Earth spinning created from those images.
The Earth Polychromatic Imaging Camera, or EPIC, is one million miles from the planet.
The camera is attached to NOAA’s Deep Space Climate Observatory, or DSCOVR, satellite.
DSCOVR orbits where the matching pull of gravity from the sun and Earth allows the satellite to stay relatively stable between the two bodies. From this distance, EPIC captures a color image of the sunlit side of Earth at least once every two hours. This capability allows researchers to track features as the planet rotates in the instrument's field of view.

- Mars Rover Photos:Image data collected by NASA's Curiosity, Opportunity, and Spirit rovers on Mars.
Image data are gathered by NASA's Curiosity, Opportunity, and Spirit rovers on Mars.
Each rover has its own set of photos stored in the database.
Photos are organized by the sol (Martian rotation or day) on which they were taken, counting up from the rover's landing date.
A photo taken on Curiosity's 1000th Martian sol exploring Mars, for example, will have a sol attribute of 1000. If instead you prefer to search by the Earth date on which a photo was taken, you can do that too.

- NASA Image and Video Library:Access to the NASA Image and Video Library.
NASA Image and Video Library allows users to search, discover and download a tons of NASA images, videos and audio files from across the agency’s many missions in aeronautics, astrophysics, Earth science, human spaceflight, and more. The website also displays the metadata associated with images.

- Asteroids - NeoWs.
NeoWs (Near Earth Object Web Service) is a RESTful web service for near earth Asteroid information. With NeoWs a user can: search for Asteroids based on their closest approach date to Earth, lookup a specific Asteroid with its NASA JPL small body id, as well as browse the overall data-set.