The Supernova and Cepheids of Spiral Galaxy UGC 9391

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APOD: 2016 June 6 – The Supernova and Cepheids of Spiral Galaxy UGC 9391

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2016 June 6

Explanation: What can this galaxy tell us about the expansion rate of the universe? Perhaps a lot because UGC 9391, featured, not only contains Cepheid variable stars (red circles) but also a recent Type Ia supernova (blue X). Both types of objects have standard brightnesses, with Cepheids typically being seen relatively nearby, while supernovas are seen much farther away. Therefore, this spiral is important because it allows a calibration between the near and distant parts of our universe. Unexpectedly, a recent analysis of new Hubble data from UGC 9391 and several similar galaxies has bolstered previous indications that Cepheids and supernovas are expanding with the universe slightly faster than expected from expansion measurements of the early universe. Given the multiple successes of early universe concordance cosmology, astrophysicists are now vigorously speculating about possible reasons for this discrepancy. Candidate explanations range from the sensational, such as the inclusion …read more

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Written By juliooliveira

I’m from Sao Paulo / Brazil, married with a incredible woman called Francine and I have two lovely children: Sarah (8 years old) and Nicolas (2 years old). Currently enrolled at the master degree program (MSc) in Information Systems Management at the University of Liverpool (UK). Holder of the credentials PMP and PMI-ACP of the Project Management Institute (PMI).

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