Simulations find ghostly whirls of dark matter trailing galaxy arms - Ars Technica

Read also:

• Why do siblings (or other close relatives) stop visiting each other as they grow older? Why does this happen with so many people nowadays?
• Why is there so much evil in the world?
• Rory defends snubbing media, cites 'weird week' - ESPN
• Why is it after eating almonds when I’m occupied, I don’t feel mild itch, but as soon as I have nothing to do, I feel mildly itchy?
• AI Links Early Life Risks to Behavioral Challenges at Age Five - Neuroscience News
• I see ugly guys dating gorgeous, "hot" women all the time. I, too, am not very attractive but I'm not doing well with the ladies. What's their secret?
• What are the pros and cons of living in Male, Maldives?
• Don't miss the half-lit first quarter moon rise tonight — Here's what to look for - Space
• Do you like high heels?
• What are the ten cars that make me no longer feel inferior?
• How do you help patients stop hearing voices?