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Can Earth’s gravity really steer a spacecraft to Jupiter?

Tuesday 2026-09-29

Juice spacecraft passing above Earth’s curved horizon during a gravity-assist flyby.

On 28 September, the European Space Agency’s Jupiter Icy Moons Explorer, Juice, skimmed past Earth in a manoeuvre that turned our planet into a celestial steering wheel. The deflected the spacecraft’s by 20 degrees and increased its velocity by 3.5 km/s, while demanding remarkably little . At closest approach, Juice passed 8,640 km above the Indian Ocean at 13:45 CEST. In the preceding four weeks, controllers needed just one tiny corrective nudge despite having set aside six opportunities. That precision matters: every kilogram of fuel conserved during the cruise can later support more ambitious operations around Jupiter and its ocean-bearing moons. In other words, mission planners are making Earth do some of the heavy lifting.

The encounter was not merely navigational. Earth also served as a familiar laboratory for of Juice’s 10 scientific instruments, while the spacecraft crossed the and measured magnetic fields and charged particles. Teams had to prioritise observations under tight operational , particularly when Juice entered Earth’s shadow and relied on battery power. The spacecraft will return for another Earth flyby in January 2029 before heading towards Jupiter, which it is due to reach in 2031; once there, the mission plans 35 flybys of Ganymede, Europa and Callisto. The elegant trick behind this long journey is the effect: rather than carrying enough fuel to brute-force its way across the Solar System, Juice repeatedly borrows momentum from planets — a reminder that, in spaceflight, finesse can beat force.

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Pro-Level English · 18 questions

Test your English

  1. Question 1 · Reading & inferenceThe Earth flyby increased Juice’s velocity by 3.5 km/s.
  2. Question 2 · Reading & inferenceControllers used all six planned correction opportunities before the flyby.
  3. Question 3 · Reading & inferenceJuice is expected to reach Jupiter in 2029.
  4. Question 4 · Reading & inferenceWhy is conserving propellant during the cruise important?
  5. Question 5 · Reading & inferenceWhy was Earth useful beyond navigation?
  6. Question 6 · Reading & inferenceWhat broader principle does the final sentence illustrate?
  7. Question 7 · Grammar & phrasal verbsIn `having set aside six opportunities`, `set aside` most nearly means:
  8. Question 8 · Grammar & phrasal verbsChoose the best transformation: `Controllers needed just one tiny corrective nudge.`
  9. Question 9 · Grammar & phrasal verbs`Rather than carrying enough fuel to brute-force its way...` expresses:
  10. Question 10 · Grammar & phrasal verbsWhich form best completes: `Had the navigation been less precise, Juice ___ more propellant.`
  11. Question 11 · PrepositionsJuice passed 8,640 km ___ the Indian Ocean.
  12. Question 12 · PrepositionsThe spacecraft relied ___ battery power in Earth’s shadow.
  13. Question 13 · PrepositionsJuice borrows momentum ___ planets.
  14. Question 14 · PrepositionsThe mission will make detailed observations ___ Jupiter’s moons.
  15. Question 15 · Vocabulary or SynonymsIn context, `trajectory` is closest to:
  16. Question 16 · Vocabulary or Synonyms`constraints` is closest to:
  17. Question 17 · Vocabulary or Synonyms`finesse` in the final sentence most nearly means:
  18. Question 18 · Vocabulary or Synonyms`propellant` is best defined as:

Today’s expression

do some of the heavy lifting

Meaning: perform a substantial or difficult part of the work.

Example: Earth’s gravity does some of the heavy lifting by changing Juice’s speed and direction without a large fuel burn.