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  An   asteroid   the size of a jumbo jet will have a close encounter with Earth today (Sept. 1), zooming past our planet at about one-third the average distance to the moon.  Asteroid 2011 ES4  will make its closest approach today at 12:12 p.m. EDT (1612 GMT),  according to NASA . At that time, it will be about 75,400 miles (121,000 kilometers) from Earth. Because the object's orbit isn't well known, it could pass even closer than that, at a distance of just 45,400 miles (73,000 km), NASA added.  "Will asteroid 2011 ES4 hit Earth? No!," NASA's Asteroid Watch outreach arm  wrote on Twitter . "2011 ES4's close approach is 'close' on an astronomical scale but poses no danger of actually hitting Earth." The asteroid measures somewhere between 72 feet to 161 feet in diameter (22 to 49 meters), or about the size of a commercial airliner. During its close approach, it will be traveling at a speed of 18,253 mph (29,376 kph). Video:  Airplane-size as...

  Ever since the first cases of COVID-19 were identified in Wuhan, China in December 2019, researchers have been scrambling to develop an effective vaccine. And, according to the nation's top infectious disease expert,   Dr. Anthony Fauci , by the end of the year we should know whether or not a vaccine will be ready for distribution by early 2021. Read on, and to get through this pandemic at your healthiest, don't miss these   Sure Signs You've Already Had Coronavirus . In a new interview with UK's  The Times , Fauci revealed that the trials currently underway in the United States will rear results by November, and we should have a good idea of their safety and efficacy. "The way the pace of the enrollment is going on and the level of the infections that are going on in the United States, it is likely that we'll get an answer by the end of the year," he explained. "I would say a safe bet is at least knowing that you have a safe and effective vaccine b...