You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "The Energia Lunar Expedition was a project during 1988 to create a lunar base using the Energia booster, initiated by which Soviet engineer, and designer of rocket engines during the Soviet/American Space Race?" whose answer is Valentin Petrovich Glushko.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Energia Lunar Expedition Soviet engineer designer rocket engines
Useful Output:

Doc 1: For the N1 moon rocket, Korolev had to design a powerful engine that would work on keralox and lift a rocket with a mass of almost 3 million kg.
Doc 2: Just to point it out, the engines of the boosters (RD-170) were oxidizer rich staged combustion. The ones in this picture were fuel rich.
Doc 3: Standing 75 metres tall, the rocket would use a core stage powered by three hydrogen-fed RD-0120 engines, which according to GKMPT, could be
Doc 4: The Energia Lunar Expedition was a project that was proposed by Soviet engineer Valentin Glushko in 1988 which would've aimed to create a lunar base.
Doc 5: One of three designs proposed for the prospective Russian super-rocket closely resembles the Soviet-era Energia booster. In shown configuration,