Seven-year-old Harry Byrne, who has just completed a challenge travelling the distance twice around the moon (13,500 miles) to raise awareness and money for his little brother Reuben (pictured). See SWNS story SWBRmoon; A seven-year-old boy has raised over £10,000 for his terminally ill little brother after walking, running, cycling and swimming the circumference of the MOON - twice. Harry Byrne has spent the last three months covering more than 13,500 miles with the help of a team of dedicated 'moon trekkers', for his little brother Reuben, two. Reuben was born with a condition that causes his brain to deteriorate and so rare it doesnt have a name yet - and there are fewer than 20 recorded cases worldwide. Doting brother Harry often tells his younger brother he loves him "to the moon and back", and wanted to prove it by travelling the circumference of the moon - a feat that he remarkably managed twice.