White Dwarf Migration in Ancient Star Clusters

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Using NASA’s +Hubble Space Telescope, astronomers have captured for the first time snapshots of fledgling white dwarf stars beginning their slow-paced, 40-million-year migration from the crowded center of an ancient star cluster to the less populated suburbs.

White dwarfs are the burned-out relics of stars that rapidly lose mass, cool down, and shut off their nuclear furnaces. As these glowing carcasses age and shed weight, their orbits begin to expand outward from the star cluster’s packed downtown. This migration is caused by a gravitational tussle among stars inside the cluster. Globular star clusters sort out stars according to their mass, governed by a gravitational billiard-ball game where lower mass stars rob momentum from more massive stars. The result is that heavier stars slow down and sink to the cluster’s core, while lighter stars pick up speed and move across the cluster to the edge. This process is known as “mass segregation.” Until these Hubble observations, astronomers had never definitively seen the dynamical conveyor belt in action.

Astronomers used Hubble to watch the white-dwarf exodus in the globular star cluster 47 Tucanae, a dense swarm of hundreds of thousands of stars in our Milky Way galaxy. The cluster resides 16,700 light-years away in the southern constellation Tucana.

Please join your hosts +Tony Darnell, Dr.+Carol Christian, and +Scott Lewis as they explore this amazing migration of white dwarfs in ancient star clusters.

#Science   #ScienceEveryday   #Space   #Hubble25   #Cosmology   #Astronomy   #Spitzer   #Keck   #STEM

Gamepad: Ft. David Brown | TGN Gamers’ Homes

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TGN Gamepad is the first of many shows that put the focus back on our Partners. Gamepad throws you right into the uncensored lives and homes of YouTube’s top gamer personalities, giving you a sneak peak of their stomping grounds and their quirky off-screen habits.

Don’t forget to let us know whose gamepad you’d like to see next in the comments!

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UFC 187: Daniel Cormier’s Second Chance

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Daniel Cormier didn’t expect his next fight to be for the light heavyweight title, but he said that when opportunity is knocking at the door, you answer. Hear his entire sitdown pre-fight interview with UFC correspondent Megan Olivi.

UFC 187: Open Workout Highlights

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UFC correspondent Megan Olivi recaps Wednesday’s UFC 187 Open Workouts. Check out interviews with Chris Weidman, Vitor Belfort, Daniel Cormier, Anthony Johnson, and Donald Cerrone.

Iron Man – Speed Painting (#Photoshop) | CreativeStation

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تحدي احر فلفل في العالم | Ghost Pepper Challenge

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ايش الي في فمي: https://youtu.be/54FuzSZlQZ0
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More Lorraine! What’s our golden buzzer winner been up to now? | Britain’s Got Talent 2015

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Lovely Lorraine Bowen has been spreading the crumble love since her golden-buzzer-winning performance last Saturday night.

She’s even had her catchy song about the nations favourite pud translated into Italian and Japanese!

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