Space and astronomy news
If you, like me, have used telescopes to gaze out at the wonders of the Universe, then you too may have been a little captivated by the topic of gravitational lensing. Think about it: how cool is it that the very universe we are trying to explore is actually providing us with telescopes to probe the darkest corners of space and time?
You might have heard of Albert Einstein. In his general theory of relativity, he describes how the presence of matter can distort space around them. The famous analogy of placing a bowling ball at the centre of a large rubber sheet causes a dip centred around the mass of the bowling ball. Any object rolling past the ball would find itself traveling through ‘curved space’ and, therefore, find its path to be altered.
In a conventional gravitational lens, a large mass – such as a cluster of galaxies – sits between a more distant object and the Earth. As the light travels from the distant object, it is bent around the galaxy cluster, providing a lensing effect to astronomers on Earth, allowing them to a) study the distribution of matter in the lensing cluster but also to observe the more distant object a little more easily.
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