science

Orbex

Orbex is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Orbex rather than just read about it. In short: Orbital Express Launch Ltd., or Orbex, was a United Kingdom-based aerospace company that was developing commercial orbital launch vehicles, namely a small rocket called Prime and a medium-lift rocket called Proxima. Orbex was headquartered in Forres, Moray, in Scotland and had subsidiaries in Denmark and Germany.

Key takeaways

Orbex belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Orbex to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Orbex from memory before moving on to harder problems.

Reference excerpt

Orbital Express Launch Ltd., or Orbex, was a United Kingdom-based aerospace company that was developing commercial orbital launch vehicles, namely a small rocket called Prime and a medium-lift rocket called Proxima. Orbex was headquartered in Forres, Moray, in Scotland and had subsidiaries in Denmark and Germany. Orbex planned to build its future launch complex, Sutherland spaceport, on the A' Mhòine peninsula in the county of Sutherland, northern Scotland, if and when deemed necessary. After failed takeover talks with The Exploration Company, Orbex began insolvency proceedings in February 2026. The company ceased operations on 18 February 2026.

Launch site Orbex initially intended to share the Sutherland spaceport in northern Scotland with Lockheed Martin, who at the time did not have a launch vehicle, but their strategic shareholding in Rocket Lab led to speculation that they would launch with the Rocket Lab Electron rocket, but since the two vehicles (Electron and Prime) use different propellants, the two companies would have separate launch pads while sharing some common infrastructure. The planning application for the site, however, includes only one launchpad. Lockheed Martin then moved their launch plans to a competing site, SaxaVord Spaceport, in the Shetland Isles. Orbex also planned to launch from a future spaceport in the Portuguese Azores.

Timeline The company was founded in 2015 as Moonspike Ltd., with the goal of crowdfunding a private spacecraft mission to the Moon. A Kickstarter campaign running from 1 October to 1 November 2015 raised less than £79,000 out of a goal of £600,000, rendering Moonspike ineligible for the funds. Moonspike was renamed Orbital Express Launch Ltd. in 2016, with the company now aiming to provide commercial launch services of nano- and microsatellites, especially CubeSats, to polar and Sun-synchronous low Earth orbits. In July 2018, Orbex secured £30 million in public and private funding for the development of its orbital rocket system, named Prime. In October 2022 Orbex closed a £40.4 million Series C funding round. Orbex has opened a factory for Prime in Forres, Scotland that employs 150 people. In April 2024, it was reported that the company received $20.7 million in a Series D funding round, with the bulk of the funds going towards development of the Prime launch vehicle. In November 2024, Orbex announced that the first launch of Prime would be conducted from SaxaVord Spaceport instead of Sutherland. In July 2025, Orbex was preselected, along with four other European companies, by ESA for its European Launcher Challenge with funding of up to €169 million per company. In December 2025, The Exploration Company (TEC) entered talks to acquire Orbex, with the companies signing a letter of intent in January 2026, but in February 2026 talks collapsed; Financial Times reported this was after TEC "failed to win UK government funding for its high-thrust rocket engine programme, according to two people close to the situation." After talks collapsed, Orbex entered insolvency proceedings. Orbex's Danish subsidiary went bankrupt in January 2026. The company ceased operations on 18 February 2026.

See also Skyrora, another British launch service provider Rocket Lab, a US and New Zealand based smallsat launch provider Black Arrow, a retired British rocket PLD Space, another European smallsat launcher based in Spain Private spaceflight

References

Worked examples

Example 1 — a first encounter with Orbex

Start with the simplest possible case. Write down what Orbex claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Orbex before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Orbex ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Orbex

In research: Orbex appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Orbex in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Orbex is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aerospace companies of the United Kingdom, Private spaceflight companies, so understanding it makes those chapters shorter.
In everyday life: Look for Orbex outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Orbex in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Orbex means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Orbex out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Orbex in simple terms?

Why does Orbex matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Orbex?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Orbex.