Venus, Jupiter and Mars line up for skyline spectacle

Venus, Jupiter and Mars can all be seen together in the sky this week, in a rare grouping of the three planets. The planetary conjunction - in which planets "line up" due to the timing of their orbits around the Sun - has been visible for days and will continue until at least the end of the week. The planets are best seen before sunrise and will form a particularly neat triangle on Thursday.  






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