NASA has called a press conference to 'discuss new results about ocean worlds.'

The US space agency says the new findings come from both the agency’s Cassini spacecraft and the Hubble Space Telescope.

'These new discoveries will help inform future ocean world exploration - including NASA’s upcoming Europa Clipper mission planned for launch in the 2020s - and the broader search for life beyond Earth,' NASA said.

It will reveal the finding at 2pm on Thursday - but refused to give any more clues.

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Jupiter's sixth-closest moon Europa is one of the most interesting bodies in our solar system when it comes to the hunt for extra terrestrial life.

WHO WILL SPEAK AT THE ANNOUNCEMENT Thomas Zurbuchen, associate administrator, Science Mission Directorate at NASA Headquarters in Washington Jim Green, director, Planetary Science Division at NASA Headquarters Mary Voytek, astrobiology senior scientist at NASA Headquarters Linda Spilker, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California Hunter Waite, Cassini Ion and Neutral Mass Spectrometer team lead at the Southwest Research Institute (SwRI) in San Antonio Chris Glein, Cassini INMS team associate at SwRI William Sparks, astronomer with the Space Telescope Science Institute in Baltimore Advertisement

The event, to be held at the James Webb Auditorium at NASA Headquarters in Washington, will include remote participation from experts across the country.

The include several members of the Cassini team, raising speculation the announcement could be a revelation about Jupiter's sixth-closest moon Europa, ahead of the 2020 Europa Clipper mission, or Enceladus, the sixth-largest moon of Saturn.

Jupiter's sixth-closest moon Europa is one of the most interesting bodies in our solar system when it comes to the hunt for alien life.

The moon, which lies 500 million miles from the sun, has an ocean lying beneath its surface which makes it one of the most likely places in the solar system for life to thrive.

Because Europa has the potential to have more liquid water than we have on Earth, some have speculated that the surprise reveal could be evidence for life.

The 1,900-mile-wide (3,100 km) moon harbors a huge ocean of liquid water beneath its icy shell.

Astronomers think this ocean is in contact with Europa's rocky mantle, making all sorts of interesting chemical reactions a possibility.

Instead of direct evidence of life, however, experts have said it is more likely to be a step towards finding it.

The announcement could be related to faint plumes of water spotted on the moon back in 2012. This graphic shows the location of water vapor detected over Europa's south pole in December 2012

This is an artist's concept of a plume of water vapour thought to be ejected off the frigid, icy surface of the Jovian moon Europa, about 500 million miles (800 million km) from the sun

JUPITER'S ICY MOON Jupiter's icy moon Europa is slightly smaller than Earth's moon. Europa orbits Jupiter every 3.5 days and is tidally locked - just like Earth's Moon - so that the same side of Europa faces Jupiter at all times. It is thought to have an iron core, a rocky mantle and a surface ocean of salty water, like Earth. Unlike on Earth, however, this ocean is deep enough to cover the whole surface of Europa, and being far from the sun, the ocean surface is globally frozen over. Many experts believe the hidden ocean surrounding Europa, warmed by powerful tidal forces caused by Jupiter's gravity, may have conditions favourable for life. Advertisement

The announcement could be related to faint plumes of water spotted on the moon back in 2012.

Hubble used a spectrograph to see normally invisible plumes of water vapour, shown in pictures as blue pixels above the moon.

'By far the simplest explanation for this water vapour is that it erupted from plumes on the surface of Europa,' lead author Lorenz Roth of Southwest Research Institute in San Antonio said at the time.

'If those plumes are connected with the subsurface water ocean we are confident exists under Europa's crust, then this means that future investigations can directly investigate the chemical makeup of Europa's potentially habitable environment without drilling through layers of ice.

'And that is tremendously exciting.'

Bill McKinnon, a planetary scientist at Washington University in St. Louis, told Business Insider the announcement is likely to be connected to these plumes.

THE DEATH OF CASSINI Cassini’s mission will officially terminate on September 15, in a planned plunge. Since it left earth in 1997 and arrived at Saturn in 2004, Cassini has been touring the system with an up-close study of the planet, its rings and moons. Twenty years after leaving Earth, NASA’s Cassini spacecraft is set to embark on the ‘thrilling final chapter’ of its life. The craft has circled Saturn for 13 years – but now, it’s running low on fuel During its journey, Cassini has made dramatic discoveries, including a global ocean within Enceladus and liquid methane seas on Titan. Before Nasa's Cassini probe captured the most detailed images of Saturn ever seen, it dropped its companion Huygens on the planet's largest moon, Titan. After nearly 20 years in space, the mission is drawing near its end because the spacecraft is running low on fuel. Advertisement

'A plume confirmation would be a great thing,' McKinnon added, but 'I have no insider knowledge.'