The James Webb Space Telescope gazes out into space.

The James Webb Space Telescope, the most powerful ever sent into orbit, is due to reveal spectacular new vistas of the Universe with unprecedented clarity on Tuesday.

Distant galaxies, dazzling nebulae, and a distant big gas planet are among the observatory's first targets, according to NASA.

However, the photographs themselves have been closely hidden in order to generate anticipation for the big revelation.

"I'm looking forward to no longer having to maintain these secrets; it will be a huge relief," Klaus Pontoppidan, an astronomer at the Space .

NASA Administrator Bill Nelson has promised the "deepest view of our Universe ever obtained."

Webb's infrared capabilities are what set it apart, letting it to see past cosmic dust clouds and identify light from the first stars.

That has been stretched into infrared wavelengths as the Universe has expanded.

This allows it to see further back in time than any previous telescope, to just after the Big Bang 13.8 billion years ago.

"When I first viewed the photographs... I immediately discovered three things about the Universe that I didn't know before," Dan Coe.

an STSI astronomer and expert on the early Universe, told AFP. "It's completely blown my head."