Space exploration is about to achieve a historic milestone. The BepiColombo mission, launched in 2018 as a joint effort between the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA), is in its final stretch to become the first spacecraft to orbit Mercury, the smallest and closest planet to the Sun in our solar system.
On September 3, 2026, the spacecraft will separate its transfer module, the component that has propelled it throughout the journey. This step will initiate the final approach phase, culminating in the orbital insertion maneuver scheduled for November 2026. It will be a critical moment: the probe must slow down enough for Mercury's gravity to capture it, without succumbing to the intense solar radiation and extreme temperatures exceeding 450 °C on the planet's surface.
What is BepiColombo?
BepiColombo is a flagship-class mission by the ESA, with participation from JAXA. Its name honors the Italian scientist Giuseppe 'Bepi' Colombo, who in the 1970s devised the gravity assist technique that allowed the Mariner 10 probe to perform multiple flybys of Mercury. The mission consists of two scientific orbiters that will work together to unravel the planet's mysteries.
The Two Orbiters
- MPO (Mercury Planetary Orbiter): Developed by the ESA, it will study the planet's surface and interior, mapping its composition and structure.
- Mio: Built by JAXA, it will focus on the magnetic environment (magnetosphere) and its interaction with the solar wind.
A Seven-Year Journey with Nine Flybys
Since its launch, BepiColombo has followed a complex trajectory that included nine planetary flybys: one of Earth, two of Venus, and six of Mercury. These gravity assist maneuvers allowed it to adjust its speed and direction without using additional fuel, an engineering achievement that demonstrates the precision of the ESA and JAXA teams.
The scientific phase will officially begin in April 2027, when both orbiters are in their final orbits. The MPO will reach its final orbit in March 2027, while the Mio orbiter will be released in December 2026.
Scientific Objectives: What Will BepiColombo Look For?
The mission aims to answer fundamental questions about the formation and evolution of Mercury. Key goals include:
- Determining why Mercury has such a high density compared to other rocky planets.
- Studying its interior, magnetic field, and magnetosphere.
- Analyzing the exosphere, an extremely thin layer of gases surrounding the planet.
- Searching for water ice in permanently shadowed craters at the polar regions.
- Investigating whether the planet exhibits internal activity, such as volcanism or tectonics.
These data will not only help understand Mercury but also shed light on the formation of rocky planets in general, including Earth.
An Extreme Challenge
Proximity to the Sun makes Mercury a hostile environment. Radiation is 10 times more intense than on Earth, and temperatures can range from -180 °C at night to 450 °C during the day. The orbital insertion maneuver requires high precision: any error could divert the spacecraft or cause it to crash into the surface.
With this mission, humanity takes another step in exploring the solar system, and the results promise to rewrite textbooks about the planet closest to our star.
Source: Google News