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According to a recent paper, the Earth is caught directly in the crosshairs of a cosmic hurricane.A swarm of nearly 100 stars, accompanied by an even greater amount of dark matter, is aimed directly at our stellar neighborhood and there's nothing we can do to stop it; in fact, the vanguard is already upon us. This sounds like a perfect summer blockbuster movie, starring The Rock and Chris Pratt, or maybe Scarlett Johansson and Charlize Theron.Except this is for real. But is it a danger? Well, actually, no. Not at all. But it's potentially incredibly fascinating, with lots of interesting scientific interconnections. So, what is really going on?The story starts last April, when the Gaia satellite announced the locations and trajectories of 2 billion stars in the vicinity of the Milky Way surrounding our sun. They released the data to the public.Scientists were then able to look at the data set to see if they could spot anything peculiar. In galaxies like the Milky Way, the most common behavior is that the stars orbit the center of the galaxy in a manner broadly similar to the planets orbiting our sun. However, there are some stars that exhibit unusual motion. About a year ago, astronomers identified some "stellar streams" passing through our celestial neighborhood.One of them, called S1 (for stream 1), consists of nearly 100 stars of similar age and composition, orbiting the Milky Way in a direction exactly opposite that of normal stars. It's kind of like a handful of cars driving the wrong way down the highway, except with a much greater distance between them and with no likelihood of a collision. These stars are spread out over a few thousand light years and they will pass through the solar system's neighborhood over the course of a few million years.Astronomers identified S1 as being part of the remnants of a dwarf galaxy that collided with the Milky Way and was consumed in an epic episode of cosmic cannibalism. Dwarf galaxies are very small, typically about 1% the mass of the Milky Way. They can orbit larger galaxies and collide with the bigger galaxy, adding their mass to the parent. This is what appears to have happened in the case of S1, although the process has taken probably a billion years.Dwarf galaxies often have a disproportionately large fraction of dark matter. Dark matter is a hypothetical and still-undiscovered form of matter that interacts only gravitationally. Scientists have proposed its existence to explain many astronomical mysteries, for example the observation that most galaxies rotate faster than can be explained by the known laws of physics and the stars and gas of which they are composed.While dark matter has not yet been observed, hypothesizing its existence is the simplest and most economical explanation for myriad astronomical mysteries. Averaged over the entire universe, dark matter is thought to be five times more prevalent than the ordinary mass of stars and gas and planets.In dwarf galaxies, the fraction of dark matter is often higher. In Fornax, a well-studied dwarf galaxy orbiting the Milky Way, researchers estimate that the dark matter is between 10 and 100 times greater than the mass found in its stars.If that number holds for S1, the dark matter of the S1 stream is passing through the Earth at a much higher velocity than the more ordinary dark matter that orbits the Milky Way -- about twice as fast. It is thought that S1 dark matter is flying through the solar system at a speed of about 550 km/s, or about 1.2 million mph. While these numbers are impressive, they are misleading. Dark matter, if it exists, is extremely diffuse and it will have no discernible effect on the solar system.Because dark matter hasn't been observed yet, these velocity numbers are speculative, although they are strongly supported by a very large body of evidence. However, the prospect of high velocity dark matter flying through the Earth has suggested an opportunity to detect it.In a paper in the prestigious journal Physical Review D, researcher Ciaran O'Hare and his collaborators calculated the possibilities of discovering dark matter using both existing and proposed dark matter detectors. They considered two varieties of dark matter particles: a very heavy kind called a WIMP (weakly interacting massive particle) and a very light kind called an axion. Because the ultimate nature of dark matter is not known, it is important to be open to all possibilities.They found that the detectors they evaluated could find WIMPs for certain ranges of the particle mass. However, when they looked at the axion possibility, it appeared the prospects were even better. Because of its light mass and the manner in which an axion would interact with the detector, the apparatus simply has a better chance of seeing the axion. (If axions exist, of course.)Experiments with names like ADMX, MADMAX and ABRACADABRA are able or will be able to search for the signatures of dark matter proposed in the recent paper. They consist of technologies that are designed to interact with axions in a strong magnetic field and convert them to ordinary microwaves or radio waves that can be easily detected.It's important to remember that the S1 stream poses no credible threat to the Earth and humanity. There is no need for an action hero to save us. However, the synergy of science is staggering. A careful catalog of nearby stars has opened the prospect of a better possibility of finding and identifying dark matter, which is one of the great unanswered mysteries of modern physics. It's an amazing time we live in, in which we can study such things.\ 5625

ALBANY, N.Y. (AP) — New York is urging travelers from eight additional states to self-quarantine for 14 days as it awaits a decision on the reopening of indoor dining in New York City. Gov. Andrew Cuomo said in a television interview that he plans to send state police and health and liquor officials to New York City on Tuesday night ahead of his decision expected Wednesday. Last week, Cuomo and counterparts in New Jersey and Connecticut announced a travel advisory requiring people from states with "increased prevalence of COVID-19" to quarantine for two weeks. That advisory applies to states with a positive test rate higher than 10 per 100,000 residents, or a test positivity rate higher than 10%.Tuesday, California, Georgia, Iowa, Idaho, Louisiana, Mississippi, Nevada, and Tennessee were added to New York’s travel advisory. Those states join Alabama, Arkansas, Arizona, Florida, North Carolina, South Carolina, Texas, and Utah.The Democratic governor said he’s worried by reports that dining in closed, indoor areas with air-conditioned systems could lead to spikes in COVID-19. Cuomo has warned that those out-of-state travelers could lead to a rise in infections. 1185

Almost one third of friends and neighbors are active duty military or veterans and their dependents. Serving the needs of military families in San Diego is integral and more important than ever. Did you know? Military, Veterans, and family members residing in San Diego County: 290

ABSARD, Iran (AP) — State television says an Iranian scientist was killed in a targeted attack killed in Absard, a small city just east of the capital, Tehran. State TV says the attack on the scientist, named Mohsen Fakhrizadeh, saw gunmen use explosives and machine gun fire. He was attacked by "armed terrorist elements," according to state TV, and died at a local hospital after first responders couldn't revive him.Israel has alleged the man led the Islamic Republic’s military nuclear program until its disbanding in the early 2000s.Iran’s foreign minister is alleging the killing of Fakhrizadeh has “serious indications” of an Israeli role. Mohammad Javad Zarif made the statement Friday on Twitter.“Terrorists murdered an eminent Iranian scientist today. This cowardice—with serious indications of Israeli role—shows desperate warmongering of perpetrators,” Zarif wrote. "Iran calls on int'l community—and especially EU—to end their shameful double standards & condemn this act of state terror."Israel declined to immediately comment on the killing of Fakhrizadeh, who Israeli Prime Minister Benjamin Netanyahu once called out in a news conference saying: “Remember that name.”Israel has long been suspected of carrying out a series of targeted killings of Iranian nuclear scientists nearly a decade ago. 1323

Alabama Republican Senate candidate Roy Moore says he's being hounded by the news media over sexual allegations against him, while briefly addressing the controversy Tuesday night."Why do you think they're giving me this trouble? Why do you think I'm being harassed by media and by people pushing allegations in the last 28 days of the election? ... After 40-something years of fighting this battle, I'm now facing allegations and that's all the press wants to talk about," Moore said while speaking at a church conference in Jackson, Alabama.Moore, an evangelical Christian who was twice ousted as Alabama's chief justice, suggested he's being attacked for his hardline views on faith in public life as part of an ongoing "spiritual battle.""But I want to talk about the issues," he added. "I want to talk about where this country's going, and if we don't come back to God, we're not going anywhere."Multiple women have said that Moore pursued relationships with them when they were teenagers while he was in his 30s. One woman said she was 14 years old when Moore initiated sexual contact with her. And on Monday, a separate Alabama woman alleged Moore sexually assaulted her when she was a teenager, and described her experience at a news conference, represented by attorney Gloria Allred.Moore characterized those allegations as politically motivated, and quipped during his Tuesday night speech that he's the "only one that can unite Democrats and Republicans, because I seem to be opposed by both."Republicans have continued to voice concern over Moore's campaign bid amid the allegations, and as of Tuesday night, the Republican National Committee had withdrawn from a joint fundraising agreement with Moore, according to a Federal Election Commission filing.Monday, Senate Majority Leader Mitch McConnell said Moore should step aside."I believe the women, yes," McConnell said.Moore, who has repeatedly denied the allegations, has also threatened to sue The Washington Post over the report that broke the news last week."The Washington Post published another attack on my character and reputation because they are desperate to stop my political campaign. These attacks said I was with a minor child and are false and untrue -- and for which they will be sued," Moore said Sunday night during a campaign speech in Huntsville, Alabama.Moore is running for Attorney General Jeff Sessions' old Senate seat, currently occupied by Sen. Luther Strange, R-Alabama. 2497