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It has been 10 years since Venus last crossed the sun, June 5, 2012. (Photo : NASA/SDO, HMI) A picture detailing Venus' trail as it crosses the sun in 2012.
Optical telescopes concentrate light in the visible spectrum so that astronomers can look at objects millions of light-years away. This article looks at how optical telescopes work and their development over time.
BEING able to reach for the stars has been made a lot easier thanks to the telescope - which allows us to see them all up close.The telescope has seen