M82: Starburst Galaxy with a Superwind

M82 is a starburst galaxy with a superwind. In fact, through ensuing supernova explosions and powerful winds from massive stars, the burst of star formation in M82 is driving a prodigious outflow. Evidence for the superwind from the galaxy’s central regions is clear in sharp telescopic snapshot. The composite image highlights emission from long outflow filaments of atomic hydrogen gas in reddish hues. Some of the gas in the superwind, enriched in heavy elements forged in the massive stars, will eventually escape into intergalactic space. Triggered by a close encounter with nearby large galaxy M81, the furious burst of star formation in M82 should last about 100 million years or so. Also known as the Cigar Galaxy for its elongated visual appearance, M82 is about 30,000 light-years across. It lies 12 million light-years away near the northern boundary of Ursa Major. via NASA https://ift.tt/3k6N9N0

Wikipedia article of the day for July 9, 2021

Wikipedia article of the day is Red-bellied black snake. Check it out: Article-Link Summary: The red-bellied black snake (Pseudechis porphyriacus) is a species of elapid snake native to Australia. Described by George Shaw in 1794, it is one of eastern Australia’s most commonly encountered snakes. Averaging around 1.25 metres (4 ft) in length when fully grown, it has glossy black upperparts, bright red or orange flanks and a pink or dull red belly. It generally avoids people, but can attack if provoked. Although its venom is capable of causing significant illness, containing neurotoxins, myotoxins, coagulants and haemolysins, it is less venomous than that of other Australian elapid snakes, and no humans have been confirmed to have died from its bite. The snake forages in bodies of shallow water, commonly with tangles of water plants and logs, where it hunts frogs, its main prey item, as well as fish, reptiles and small mammals. Its numbers are thought to be declining due to habitat fragmentation and falling frog populations.