A supermassive black hole, however, could also explain the extreme luminosity of HD1. As it gobbles down enormous amounts of gas, high energy photons may be emitted by the region around the black hole. Astronomers Have Discovered the Most Distant Galaxy Ever.
The Oldest Stars: Mr Universe | 93 9 & 101 5 The River wrsi.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wrsi.com Daily Mail and Mail on Sunday newspapers.
Globular clusters are the oldest visible objects in the Universe – each contains hundreds of thousands to occasionally over one million stars, all born at essentially the same time. They are densely packed into a spherical volume with a diameter over a thousand times smaller than the diameter of the Milky Way Galaxy. Globular clusters are thought to have formed soon after the Universe began nearly 13.8 billion years ago, at the same time as, or perhaps even before, the first galaxies formed.
Harbor Oldest Stars in the Universe
Some of the oldest stars in the universe are found in ancient globular clusters that orbit around the halo of our home galaxy. The Milky Way is circled by at least 150 globular clusters, each harboring hundreds of thousands, and sometimes millions of stars. Globular clusters formed very early in the vast halo surrounding the embryonic Milky Way before it flattened to form a spiral disk.
“The Sun is 10 billion times brighter than an Earth-like planet around it, so that’s a lot of light you have to suppress if you want to see an orbiting planet. A K star might be ‘only’ a billion times brighter than an Earth orbiting around it,” said Giada Arney of NASA’s Goddard Space Flight Center. And, they live a very long time 17 billion to 70 billion years, compared to 10 billion years for the Sun giving plenty of time for life to evolve. Also, K stars have less extreme activity in their youth than the universe’s dimmest stars, called M stars or “red dwarfs.”
Posted: Jan 11, 2021
Photo 2, caption and credit in text
University of Hawaiʻi Astronomers Using W. M. Keck Observatory Discover Ancient Magma World Orbiting a Chemically Unusual Star
Maunakea, Hawaii - “They should have sent a poet,” says Ellie Arroway in the film Contact as, suspended in outer space, she gazes upon a spiral galaxy. Almost all of the planets discovered to date (including the solar system planets) are confined to the plane of the Milky Way, unable to glimpse such a sweeping vista of our galaxy. However, astronomers at the University of Hawaiʻi Institute for Astronomy (IfA) using the W. M. Keck Observatory on Maunakea have discovered a rocky planet with a different kind of view.