By Heather Couper;Nigel Henbest

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Stellar 0i photographs 9 jfcEi Surface photographs. +m Mapping the Moon such precision, the lunar Thousands of overlapping sky and Moon photographs features could were exactly, so that highly individually cross- referenced. Because the stars' positions are known to accurate be lined Moon maps up could be made. 27 Mapping This star chart-shows stars and the Stars the major all constellations visible in both the Northern and Southern hemispheres. It is made by "unwrapping" the celestial •sphere.

The "twinkling" is caused by the continual shifting of our own atmosphere. Stars are huge balls of luminous gas, many of them far bigger and brighter than our Sun, although they all seem faint because they are so far away. The range in brightness we see among the stars is partly due to differences in size and temperature, and partly due to the fact that they lie at different dis- mi On a really clear, > Today, star positions are known so precisely that the astronauts on the Apollo 15 lunar mission were able to use them to map the Moon very accurately.

Create South celestial pole 26 _ _'. - . Stellar 0i photographs 9 jfcEi Surface photographs. +m Mapping the Moon such precision, the lunar Thousands of overlapping sky and Moon photographs features could were exactly, so that highly individually cross- referenced. Because the stars' positions are known to accurate be lined Moon maps up could be made. 27 Mapping This star chart-shows stars and the Stars the major all constellations visible in both the Northern and Southern hemispheres. It is made by "unwrapping" the celestial •sphere.

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