WATCH | Europe’s Jupiter moons mission launches on second attempt

  • Europe’s space agency launched their mission to Jupiter’s moons on Friday. 
  • The JUICE probe will enter Jupiter’s orbit in July 2031. 
  • The probe launched on an Ariane 5 rocket from French Guyana. 

The European Space Agency’s JUICE space probe blasted off Friday on a mission to discover whether Jupiter’s icy moons are capable of hosting extraterrestrial life in their vast, hidden oceans.

The launch on an Ariane 5 rocket from Europe’s spaceport in Kourou, French Guiana came after a previous attempt on Thursday was called off due to the risk of lightning.

Despite cloudy skies, the rocket took off as planned at 09:14 am local time, with teams on site saying it was on the correct trajectory.

The probe separated as planned at an altitude of 1 500km, 27 minutes after launching from Europe’s spaceport in Kourou.

The Jupiter Icy Moons Explorer (JUICE) plans to take a long and winding path to the gas giant, which is 628 million km from Earth.

It will use several gravitational boosts along the way, first by doing a fly-by of Earth and the Moon, then by slingshotting around Venus in 2025 before swinging past Earth again in 2029.

When the probe finally enters Jupiter’s orbit in July 2031, its 10 scientific instruments will analyse the Solar System’s largest planet as well as its three icy moons Europa, Ganymede and Callisto.

Oceans of water

The moons were first discovered by astronomer Galileo Galilei more than 400 years ago, but were long ignored as potential candidates for hosting life.

However, the discovery of huge oceans of liquid water – the main ingredient for life as we know it – kilometres beneath their icy shells has made Ganymede and Europa prime candidates to potentially host life in our celestial backyard.

JUICE will focus on Ganymede, the Solar System’s largest moon and the only one that has its own magnetic field, which protects it from radiation.

In 2034, JUICE will slide into Ganymede’s orbit, the first time a spacecraft will have done so around a moon other than our own.

NASA’s Europa Clipper mission, which is scheduled to launch in October 2024, will focus on Ganymede’s sibling Europa.

Neither mission will be able to directly detect the existence of alien life, but instead hope to establish whether the moons have the right conditions to harbour life.

Only a future mission which would land on – and possibly drill into – the surface could confirm whether life exists below.

Extraordinary mission

If life is there, scientists theorise it would likely be primitive microbes like bacteria, which are capable of surviving on Earth in such extreme environments.

JUICE has 10 scientific instruments – including an optical camera, ice-penetrating radar, spectrometer and magnetometer – which will analyse the local weather, magnetic field, gravitational pull and other elements.

It also has a record 85 square metres of solar panels to collect as much energy as possible near Jupiter, where sunlight is 25 times weaker than on Earth.

The 1.6-billion-euro mission will mark the first time Europe has sent a spacecraft into the outer Solar System, beyond Mars.

Philippe Baptiste, head of France’s CNES space agency said:

This is an extraordinary mission that shows what Europe is capable of.

Friday marked the second-last launch for the Ariane 5 rocket, before it is replaced by the next-generation Ariane 6.

Repeated delays for the Ariane 6, as well as Russia pulling its Soyuz rockets in response to sanctions over the war in Ukraine, have left Europe struggling to launch its mission into space.


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