Chandra data of Circinus X-1 reveal a set of four rings that appear as circles around the neutron star, providing a rare opportunity to determine the distance to an object on the other side of the Milky Way galaxy. These rings can be seen in the composite image of X-rays from Chandra (red, green, and blue) with a visible light image from the Digitized Sky Survey. These rings are light echoes, which are produced when a burst of X-rays from the star system ricochets off of clouds of dust between Circinus X-1 and Earth. By combining the X-rays with radio data, astronomers can use relatively simpl
Chandra data of Circinus X-1 reveal a set of four rings that appear as circles around the neutron star, providing a rare opportunity to determine the distance to an object on the other side of the Milky Way galaxy. These rings can be seen in the composite image of X-rays from Chandra (red, green, and blue) with a visible light image from the Digitized Sky Survey. These rings are light echoes, which are produced when a burst of X-rays from the star system ricochets off of clouds of dust between Circinus X-1 and Earth. By combining the X-rays with radio data, astronomers can use relatively simple geometry to pinpoint the location of the intervening clouds and then Circinus X-1. 15-137-CircinusX1-XRayLightRings-NeutronStar-Chandra-20150624
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