Galileo is a global navigation satellite system (GNSS) that went live in 2016, created by the European Union through the European Space Agency (ESA), operated by the European Union Agency for the Space Programme (EUSPA), headquartered in Prague, Czechia, with two ground operations centres in Fucino, Italy, and Oberpfaffenhofen, Germany. The €10 billion project is named after the Italian astronomer Galileo Galilei.

One of the aims of Galileo is to provide an independent high-precision positioning system so European political and military authorities do not have to rely on the US GPS, or the Russian GLONASS systems, which could be disabled or degraded by their operators at any time. The use of basic (lower-precision) Galileo services is free and open to everyone. A fully encrypted higher-precision service is available for free to government-authorized users. Galileo is also to provide a new global search and rescue (SAR) function as part of the MEOSAR system.

The first Galileo test satellite GIOVE-A was launched 28 December 2005, while the first satellite to be part of the operational system was launched on 21 October 2011. Galileo started offering Early Operational Capability (EOC) on 15 December 2016, providing initial services with a weak signal. In October 2018, four more Galileo satellites were brought online, increasing the number of active satellites to 18. In November 2018, the FCC approved use of Galileo in the US. As of December 2023, there are 23 launched satellites that operate in the constellation, five are not available. It is expected that the next generation of satellites will begin to become operational after 2025 to replace older equipment, which can then be used for backup capabilities.

The Galileo system has a greater accuracy than GPS, having an accuracy of less than 1 m when using broadcast ephemeris (GPS: 3 m) and a signal-in-space ranging error (SISRE) of 1.6 cm (GPS: 2.3 cm) when using real-time corrections for satellite orbits and clocks.

Courtesy of Wikipedia. Image courtesy of ESA.

The European Space Agency's Ariane 6 is a highly anticipated next-generation rocket, designed to enhance Europe's ability to independently access space and compete in the global space market.

Stats

Height: 63 m (207 ft)

Diameter: 5.4 m (18 ft)

Mass: 530–860 t (520–850 long tons; 580–950 short tons)

Stages: 2

Boosters maximum thrust: 4,650 kN

First stage maximum thrust: 1,370 kN

Ariane 6 will be available in two versions depending on the performance required: a version with two boosters, called Ariane 62, and Ariane 64 with four boosters. Ariane 62 can launch payloads of approximately 4.5 tonnes into geostationary transfer orbit or 10.3 tonnes into low Earth orbit.

Ariane 64 can launch payloads of approximately 11.5 tonnes into geostationary transfer orbit and 21.6 tonnes into low Earth orbit.

The Ariane 6 represents a significant technological leap over its predecessor, the Ariane 5. Developed by the European Space Agency (ESA) in collaboration with ArianeGroup, Ariane 6 aims to bolster Europe's competitive edge in the global satellite launch market.

This next-generation launcher is envisioned as a more flexible and cost-effective successor to Ariane 5, designed to accommodate a broader spectrum of missions, including commercial satellite launches and deep space exploration. Ariane 6 is available in two variants: the Ariane 62, equipped with two solid rocket boosters, and the Ariane 64, with four boosters. This modular configuration caters to a wide range of payloads and orbits, from commercial satellites in geostationary orbit to payloads destined for deeper space​​​​.

Technological advancements in Ariane 6 include the use of the updated Vulcain 2.1 main engine and an improved upper-stage engine, the Vinci. These enhancements not only increase payload capacity but also aim to reduce operational costs. Ariane 6's development also leverages a technology-sharing approach with the Vega C launcher, particularly in the use of the P120 engine in Ariane 6’s solid rocket motors. This synergy is part of a broader strategy to maintain Europe's significant presence in the space industry, offering a reliable and versatile launch option for both governmental and commercial customers​​​​.

The ESA, along with the French space agency CNES, ArianeGroup, and launch operator Arianespace, have been diligently working towards the inaugural flight of Ariane 6. This follows a series of delays due to the Covid-19 pandemic and technical challenges. The rocket recently completed a critical hot-fire test, simulating a complete launch sequence to validate the entire flight phase of Ariane 6's core stage. This test, involving the ignition of the Vulcain 2.1 engine, is a pivotal milestone in the development process, bringing Europe closer to re-establishing its autonomous access to space.

The success of Ariane 6 is crucial for Europe, especially with the retirement of Ariane 5 and the challenges faced by the smaller Vega C, highlighting the strategic importance of Ariane 6 in Europe's space ambitions​​​​.

Overall, Ariane 6 epitomizes Europe's response to the evolving dynamics of the space launch market, characterized by increasing competition and the need for more versatile, cost-effective launch solutions. Its development underscores the importance of international collaboration in space technology and the continued pursuit of innovation to maintain a competitive edge in space exploration and satellite deployment.

Credit: Arianespace

The Ariane 6 launch site (ELA-4) is a dedicated area designed for launch vehicle final preparation, integration of the upper composite and final launch activities. Located approximately 10 km northwest of the CSG Technical Center, it includes the launch pad (ZL4), launch vehicle assembly and integration building (BAL) and support facilities.

Credit: Arianespace