I captured this galaxy last week. It's called M51 Whirlpool Galaxy. It's one of my favorites to visit.
M51 Galaxy and its companion, NGC 5195, is located about 30 million light years away. M51 estimated diameter is 76,000 light-years. It is believed a large black hole resides at the galaxy core or center.
225x30' ISO 2500 - Total iteration time 1h52m30s.