Europa Clipper launch
NASA's largest planetary spacecraft set off for Europa's buried ocean — Mars and Earth flybys will deliver it to Jupiter in 2030.
The moment of Europa Clipper launch: https://nowsky.org/e/europa-clipper-launch — opens at the right place and time, replayable, no login.
Available views: Orbit ✓ · Sky — (not visible in the sky)
The story
On 14 October 2024 NASA's largest planetary spacecraft left Kennedy Space Center on a Falcon Heavy, bound for Jupiter. With its solar arrays unfolded it spans 30.5 m, longer than a basketball court — the size needed to draw power in Jovian orbit, where sunlight is 25 times weaker than at Earth. It weighed about six tonnes at launch, half of that propellant.
The target is Europa's buried ocean. More water than all of Earth's seas combined lies beneath the ice shell, and Clipper, orbiting Jupiter, will make about 49 close passes to sound the ice thickness with radar, read the surface composition with spectrometers, and fly through any plumes it finds. The question is single: is that ocean a place where life could live?
The route is not direct. It skims Mars at 884 km on 1 March 2025, returns to Earth on 3 December 2026 for a second boost, and arrives at Jupiter on 11 April 2030. The orbit replay shows the early trajectory looping once around the inner solar system before heading out.
The last hurdle before launch was a transistor flaw that might not survive Jupiter's radiation. Months of re-testing ended with a verdict that it would hold, the launch was confirmed, and after a four-day delay for Hurricane Milton the spacecraft departed — carrying a plate engraved with a poem by US poet laureate Ada Limón and 2.6 million names.
Why it matters
Europa is the solar system's strongest candidate for a place where life could exist today. Galileo and Hubble built the case that liquid water, a heat source (Jupiter's tidal heating) and chemistry meet beneath the ice. Clipper does not land, but it is the first mission to measure directly whether those three conditions are actually met.
Because of the radiation, it orbits Jupiter on long loops and flies past Europa rather than circling it. Each pass crosses a different longitude so that 49 flybys cover the whole surface — a textbook piece of trajectory design. Its data will be cross-checked with ESA's JUICE, arriving in the Jovian system in the same period.
The mission also maps the ground for a future Europa lander: finding where the ice is thin and where plumes emerge decides where the next generation should touch down.
How to watch
Launch was at 12:06 EDT on 14 October 2024 from Kennedy pad 39A. Once away from Earth the spacecraft is invisible to the eye. The milestones are the Mars flyby of 1 March 2025, the Earth flyby of 3 December 2026 (3,000 km over Australia) and Jupiter arrival on 11 April 2030.
The orbit replay starts from Earth at launch and draws the path through the Mars and Earth flybys out to Jovian orbit in time order. Tracking the probe at high speed shows Earth and Mars sliding past while it loops the inner solar system.
Jupiter itself shows its four Galilean moons in binoculars. Selecting Jupiter in the sky view tells you which side of the planet Europa is on right now, and the Jupiter-system framing in the orbit view shows the moons' orbits at true scale.
See this for yourself — replay the moment in the orbit view
Background
Plans for Europa drifted for more than twenty years. The nuclear-powered Jupiter Icy Moons Orbiter was cancelled in the 2000s, and the early-2010s Europa orbiter concept was cut down on cost to a flyby mission — today's Clipper, named after the fast sailing ships of the nineteenth century.
The launch vehicle was contested too. Congress had mandated NASA's SLS, but vibration concerns and cost led to a 2021 switch to Falcon Heavy, which in turn meant a flyby route of five and a half years instead of a direct flight of two to three. The launch cost $178 million, less than a tenth of an SLS.
ESA's JUICE, launched in April 2023, reaches Jupiter in 2031 and later enters orbit around Ganymede. Two spacecraft exploring the Jovian system together in the early 2030s will be a first since Galileo.
FAQ
When does Europa Clipper reach Jupiter?
Scheduled for 11 April 2030, after flybys of Mars in March 2025 and Earth in December 2026.
Why does it not orbit Europa itself?
Europa's orbit lies deep in Jupiter's radiation belts, which would cut the spacecraft's life to months. Long loops around Jupiter with 49 flybys last far longer.
How big is the spacecraft?
30.5 m across with arrays deployed and about six tonnes at launch — NASA's largest planetary spacecraft.
Does it search for life directly?
No. It measures ice thickness, the ocean, composition and plumes to judge habitability; detecting life is for a later lander.
Related
- Europa Clipper Earth flyby
- Europa Clipper arrives at Jupiter
- JUICE launch
- Europa — object index
- Europa Clipper — object index
Times and figures are approximate — verify with official sources when planning travel. Simulation uses J2000 mean elements.