<ul><li>An article by Séamas O’Reilly discusses the author's trip with his son to the planetarium at the Royal Greenwich Observatory.</li><li>The journey to the planetarium involves multiple modes of transport in London.</li><li>The author's son prepared a list of questions for space boffins and is eager to learn from them.</li><li>During the visit, the author's son engages in a series of inquisitive conversations with a fellow passenger and the young physicist at the planetarium.</li></ul>

Astronomers are used to fielding tough questions, but these are out of this world | Séamas O’Reilly

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