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Does a comet's period change because it loses mass every time it nears the Sun?
Do the periods of comets decrease because they lose mass every time they get near the Sun? Robert BaileyConover, Wisconsin ...
'Planetary parade' will see SIX planets align in rare spectacle - here's the best time to spot Mars, Jupiter, Neptune, Saturn, Uranus and Venus in the night sky
On Tuesday evening, six planets will line up in the night's sky - Mars, Jupiter, Neptune, Saturn, Uranus and Venus. Best ...