The successor to the Hubble Space Telescope is reaching some key milestones in its preparation for launch in 2018.

NASA has been working to assemble a huge mirror the Goddard Space Flight Center in Greenbelt, Maryland. The mirror is intended to be a centerpiece for a huge telescope more powerful than the Hubble Space Telescope.

Our universe consists mostly of matter we can't see, and its expansion is being accelerated by a force that can't be explained. Find out what Hubble has learned about dark matter and dark energy in our new 25th anniversary article, "What...

En celebración del 25 aniversario del Telescopio Espacial Hubble, explore 25 de las imágenes más impresionantes y significativas captadas por el Hubble. Desde los planetas en nuestro propio sistema solar hasta las instantáneas que capturan...

The Webb Space Telescope will see some of the first sources of light that ended the mysterious time period of the universe known as the "Dark Ages." Find out more about the Dark Ages and these first, brilliant stars in our 25th anniversary...

Monster-sized black holes lurk in the centers of galaxies. Thanks to Hubble, we now know these black holes are tied to the evolution of the galaxies they live within. Find out how Hubble provided conclusive evidence of the existence of...

Stars form from clouds of gas and dust. The Webb Space Telescope, designed to see infrared, is the perfect tool for peering through dusty stellar nurseries to the newborn stars within. Find out what mysteries Webb will untangle with our new...

Galaxies didn't always look like the graceful spiral and glowing ellipitcal galaxies we see today. The earliest galaxies were small, lumpy clumps of stars. The Webb Space Telescope will build on the work of Hubble to tell us how those...

Hubble's successor, the James Webb Space Telescope, will be used to investigate our own solar system, tracking the weather on other planets, looking for unidentified sources of water on Mars, and examining the effects of comet and asteroid...