Rosetta and Philae
Travelling alongside a comet rather than merely visiting it.
ESA designed Rosetta to investigate comet 67P/Churyumov–Gerasimenko at close range over an extended interval. The orbiter followed changing activity as the comet approached the Sun. Philae reached the surface on 12 November 2014. Together they represent studying one target at different scales.
- Launch
- 2004
- Philae reached the surface
- 12 November 2014
- Destination
- 67P / Churyumov–Gerasimenko
01 / RESEARCH LAYER
Rendezvous with the target
A high-speed comet flyby differs from travelling alongside it. Rosetta provided an opportunity to study change over time. During its long journey, trajectory design and gravity assists enabled approach with appropriate speed and geometry.
02 / RESEARCH LAYER
Relationships between gas, dust and surface
A comet warms as it approaches the Sun; volatile materials contribute to gas and dust activity. Images investigate surface forms, while other instruments measure gas and dust properties. Comparing different times tests processes that a single flyby photograph cannot explain.
03 / RESEARCH LAYER
Landing on a small body
The weak, irregular gravitational field of a small body does not make landing a scaled-down version of motion on Earth. Surface structure and the probe’s final location affect power and communications. Philae’s landing illustrates considering mission plans together with uncertainty in the actual environment.
04 / RESEARCH LAYER
Questions reaching back to the early Solar System
Comet composition is valuable for investigating early planetary material and volatile transport. Finding water or organics in one object does not prove that all Earth’s water came from one source. Comparisons are tested across multiple celestial bodies and laboratory measurements.
05 / RESEARCH LAYER
Do not explain activity by distance alone
Activity may increase as a comet approaches the Sun, but different surface regions do not share identical conditions at the same time. Rotation, local shadows and material properties affect measurements. Record date, distance and illumination geometry for an image sequence. Ask whether change could reflect both immediate heating and material history. This helps avoid inferring a single cause directly from two quantities changing together.
CONNECTED INVESTIGATIONS
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Editorial review: . Mission status and catalogues can change; consult the official source for current information.