"The statistical risk to any one person of being struck by falling space debris is so low that a colleague of mine jokes that if reentry predictions put his house directly under the path, he’d go out with a camera and watch," Sorge said. The latitude of Indianapolis is 39.7 degrees, but again, the chances of any debris falling here, or any populated area, are highly unlikely. That range means the rocket's reentry could be as far north as Chicago, New York City, Rome and Beijing or as south as New Zealand and Chile, according to The Aerospace Corporation, a federally funded research and development center. But "what makes this reentry particularly noteworthy is that it will occur between 41.5 degree north and 41.5 degree south latitudes, where the vast bulk of the world’s population lives," Marlon Sorge, of Aerospace's Center for Orbital and Reentry Debris Studies, told The Aerospace Corporation. With about 70 percent of the Earth's surface covered in water, the chances of it hitting a land mass are slim, and a densely populated city even lower, according to scientists. USA TODAY Visual Glimpse: A Chinese rocket is hurtling back to Earth. Scientists don't know the exact time yet, and the location “cannot be pinpointed until within hours of its reentry,” according to a Pentagon statement to USA TODAY earlier this week. Launched on April 29, a 21-metric-ton portion of the Long March 5B - one of China's largest and heaviest spacecraft - is expected to plunge back in an "uncontrolled reentry." Over the past week, space experts and novices alike have been discussing the potential debris and impacts from the crash landing. While this rocket is on its way out, another one is hurtling back from space now and is expected to make a splash this weekend. NASA will offer live coverage of the Black Brant XII mission online beginning at 7:30 p.m.
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To avoid the problems associated with redundant links in a switched LAN, STP is implemented on switches to monitor the network topology. : 388 If redundant links are used to connect switches, then switching loops need to be avoided. : 386 However, this connection configuration creates a switching loop resulting in broadcast radiations and MAC table instability. The need for the Spanning Tree Protocol (STP) arose because switches in local area networks (LANs) are often interconnected using redundant links to improve resilience should one connection fail. Switches with Spanning Tree Protocol implementation in a local area network (LAN) Link aggregation protocols such as LACP will bond two or more links to provide fault tolerance while simultaneously increasing overall link capacity. While STP is still in use today, in most modern networks its primary use is as a loop-protection mechanism rather than a fault tolerance mechanism. STP was originally standardized as IEEE 802.1D but the functionality of spanning tree (802.1D), rapid spanning tree (802.1w), and multiple spanning tree (802.1s) has since been incorporated into IEEE 802.1Q-2014. RSTP was designed to be backwards-compatible with standard STP. RSTP provides significantly faster recovery in response to network changes or failures, introducing new convergence behaviors and bridge port roles to do this. In 2001, the IEEE introduced Rapid Spanning Tree Protocol ( RSTP) as 802.1w. STP is based on an algorithm that was invented by Radia Perlman while she was working for Digital Equipment Corporation. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails.Īs the name suggests, STP creates a spanning tree that characterizes the relationship of nodes within a network of connected layer-2 bridges, and disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. The Spanning Tree Protocol ( STP) is a network protocol that builds a loop-free logical topology for Ethernet networks. March 30: Cruz Azul, who ended Monterrey's last two trophy pursuits in the Apertura 2018 Copa MX Final and Apertura 2018 semifinals, pile on the pain with a 91st minute equalizer.March 9: Beating rivals Tigres UANL 1-0 at home, the crosstown club - currently in second place - found an 80th minute equalizer.3: Up 1-0 on the road, the victory turned into a draw when UNAM Pumas leveled in the 83rd minute 12: Led current league leaders Leon at home by a 2-0 scoreline, but conceded in 94th minute of 2-2 draw In fact, the Rayados have now dropped eight points after the 80th minute since January: The result, which keeps Monterrey third in the Liga MX standings and six points back of the top of the Clausura table, was the latest in a troubling trend of blown leads late in matches this year. That exchange set the stage for Cruz Azul's dramatic 91st minute equalizer on a corner delivered to the back post and nodded home by centerback Igor Lichnovsky, a Chilean national teammate of Sporting midfielder Felipe Gutierrez. However, the script was flipped in the 76th minute amidst controversial circumstances as Rayados penalty shouts went unanswered on one end of the field and, just 20 seconds later, Cruz Azul scored on the opposite end with a header tucked inside the near post from 10 yards out by former New England Revolution forward Milton Caraglio. In the buildup to this continental clash, is providing updates on the Rayados as part of the site’s Monitoring Monterrey series.Īfter Sporting Kansas City cruised to a 7-1 thrashing of Montreal on Saturday afternoon at Children's Mercy Park, the club's Champions League counterparts appeared to be coasting to a comfortable home win of their own as Monterrey led Cruz Azul 2-0 with 15 minutes remaining at a rain-soaked BBVA Bancomer Stadium on Saturday night thanks to a sensational bicycle kick from Aviles Hurtado on the cusp of halftime and a Cesar Montes header four minutes into the second stanza. Sporting Kansas City and Club de Futbol Monterrey will meet in the 2019 Scotiabank Concacaf Champions League semifinals. Sporting will travel to Mexico for the first leg of the aggregate-goal series on Thursday before hosting the decisive second leg at Children's Mercy Park on April 11 ( tickets on sale now). |
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