Nasa.gov

Nasa.gov is a website of National Aeronautics and Space Administration (NASA), an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research, and space research. Its domain name was registered in 1997.
The website mainly focuses on news about astronomy and progress about space age and technology, as well as a database which list all discovered exoplanets with references from observatories and a wide collection of media about astronomy.
==List of active subdomains of nasa.gov==
There are multiple active subdomains of nasa.gov which the websites host with different topics:
*science.nasa.gov - The website which covers news about space science, exoplanets and the universe.
*eyes.nasa.gov - 3D visualization of solar system, asteroids, solar neighborhoods and others available. 
*data.nasa.gov - The website that has references from the database of NASA.
*climate.nasa.gov - The website about climate change on Earth
*mars.nasa.gov - The website about Mars space exploration.
==References==