The long-delayed James Webb telescope is moving toward completion. The telescope passed a round of testing ahead of its planned launch in 2021. The spacecraft which will launch the telescope into space went through vacuum testing, in which the craft is exposed to a simulation of the space environment.

A stunning image shows an incredible 265,000 galaxies, stretching back to the early universe at 500 million years after the Big Bang. It is a mosaic of different images captured by the Hubble Space Telescope as part of its deep-field surveys, arranged into a giant overview called the Hubble Legacy Field.

NASA is launching an ambitious mission to map the entire sky in order to understand the origins of the universe. The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission will launch in 2023 and is planned to last for two years.

NASA has once again delayed the launch of the James Webb Space Telescope -- the largest and most expensive space telescope in history. The new target launch is March 2021, and the cost of the project has ballooned to $9.6 billion.

The largest and most expensive space telescope in history is finally complete, NASA announced last week, as the 20-year construction project came to an end.

More than a decade after its launch, the Spitzer Space Telescope still captures and transmits beautiful data about the cosmos.

Originally conceived in 1996, the Hubble-succeeding James Webb Space Telescope will officially launch into low Earth orbit in October of 2018.