This star-studded and galaxy-studded picture was captured by Hubble’s Vast Subject Digicam 3 (WFC3), utilizing the info collected for scientific functions. The article of curiosity is a galaxy seen within the decrease left nook of the picture, named SGAS 0033 + 02. What makes this explicit galaxy fascinating is a little bit uncommon: it seems not as soon as on this picture, however 3 times.
The thrice seen galaxy is a bit troublesome to identify: it seems as soon as as a curved arc simply to the higher proper of the very vibrant star, and twice as small spherical dots above the star and to the precise of the star respectively.
The a number of appearances of SGAS 0033 + 02 in the identical picture will not be the results of an error, however are as a substitute on account of a notable phenomenon generally known as a gravitational lens. Gravitational lensing happens when mild from a really distant galaxy, corresponding to SGAS 0033 + 02, is bent by the gravity of a large celestial object within the foreground, between the distant galaxy and the Earth.
SGAS 0033 + 02 was found by its namesake, the Sloan Big Arcs Survey (SGAS), which aimed to establish extremely magnified galaxies that have been gravitational lenses from foreground galaxy clusters. SGAS 0033 + 02 is of explicit curiosity on account of its uncommon proximity within the sky to a really vibrant star. The star is helpful, as a result of it may be used to calibrate and proper observations of the SGAS 0033 + 02 lens.