Fire in the Sky
NASA has detected but not taken measures against an asteroid that entered the Earth's atmosphere and exploded over the Caribbean.
The space agency admitted in a statement that the rock, measuring about 5 meters in size and designated 2019 MO, was first spotted when it was about 500,000 kilometres from Earth, just before it hit the atmosphere.
"This was roughly the equivalent of spotting something the size of a gnat from a distance of 310 miles (500 kilometres)," NASA said.
Comment: A loud boom attributed to an exploding meteor was heard just the day before in the New York area.
American Meteor Society: Loud boom heard in central New York caused by meteor
Robert Lunsford of the American Meteor Society says a fireball, which was larger and brighter than typical meteors, entered the Earth's atmosphere over Lake Ontario. It also caused a loud sound.
"Fireballs that are larger than normal and manage to penetrate down to the lower atmosphere will produce a sonic boom. The folks that did report some sound, they happen to be pretty close to the track of this object," Lunsford said.
York County 911 received several calls late Friday night about a loud boom in the northern end of the county, according to a dispatcher. One of the calls came around 10:50 p.m. from the area of Siddonsburg Road and Glen Arden Drive in Fairview Township.
Emergency responders in both York and Cumberland counties responded to check it out, but no one found anything, said Chris Weidenhammer, deputy fire chief for the Fairview Township Fire Department. Those that went out included Fairview, Monaghan and Lower Allen townships.
The Fairview Township Fire Department posted on its Facebook page that officials even checked a pipeline but nothing was found.
No earthquakes were recorded. "It's a great mystery," Weidenhammer said.
Comment: More views from social media:
The American Meteor Society (AMS) received 106 reports about the meteor fireball, which was seen over Alberta, MT and Saskatchewan on Sunday, September 1st 2019 around 04:28 UT.
"This fireball would have been seen for 600km from either side of it, probably," said Mike Hankey, operations manager for the American Meteor Society, who speculated that the object was likely a bolide, a very bright meteor, based on the reports he has received.
The meteor spectrum ranges from meteor, to fireball, to bolide and super bolide, which is brighter than the Moon and almost as bright as the Sun.
A large number flocked to social media to tell of the loud "bang" at around 3am. Panic set in as worried locals frantically tried to find out exactly what had happened.
It is still unclear what caused the bang, and the Scottish Fire and Rescue Service only have record of a refuse fire in the area.
After being woken through the night, social media users in the north of Glasgow speculated over the "explosion."
Walking home from work Thursday night around midnight in Spokane, Washington (because my car had a flat tire of all things), I saw the astronomical spectacle sometimes known as a "fireball," flash across part of the western sky low to the ground. It only lasted about three seconds. No time to take a picture, but I did tweet about the experience a minute later.
I wasn't the only one either. Several from Washington and British Columbia also saw the meteor fly across the sky.
This journalist was drinking on his balcony near the intersection of 49th Avenue and Tecumseh Road in College Park when he heard the mystery boom at around 1:45 a.m. Aug. 19. The sound appeared to emanate from the south, in the direction of the University of Maryland campus and College Park's Route 1 corridor. The sound was not accompanied by a flash of light, such as from lightning.
Shortly afterwards, other residents took to social media to describe the sound. One Berwyn Heights resident uploaded a security camera video recording of the boom. In the video, a, sudden, loud, thunderous report is heard, followed shortly afterwards by smaller percussive reports and rolling echos. [The boom can be heard starting at 0:19]
Comment: According to Meteorites Australia, sounds associated with a falling meteor include a "thunderous" noise.
Sounds Associated with Witnessed Meteorite Falls
Occasionally when a meteorite is witnessed to find its way to Earth, it will present a very impressive visual show as it burns through the atmosphere. Even less common though, are the occasions when witnesses are able to actually hear audible sounds associated with the falling meteor. These have been described in many various ways such as: whistling, popping, booming, thunderous, whizzing, whirling, whirring, crackling, drumming, rumbling, humming, roaring and more.

Jason Carnegie submitted this photo from Moores Mill in Huntsville, Alabama at 9:40 pm Sunday.
The American Meteor Society notes that more than 60 eyewitnesses reported the fireball in numerous states, including Virginia, North Carolina, Georgia, Tennessee, and Alabama. Eyewitnesses report the fireball was visible for roughly 1.5 - 3.5 seconds.
Additional information and reports are forthcoming regarding Sunday night's fireball. However, many across the Tennessee Valley spotted the bright feature in the sky.
The American Meteor Society defines a fireball as a meteor that shines brighter than the planet Venus.
Comment: See also: Meteorites, Asteroids, and Comets: Damages, Disasters, Injuries, Deaths, and Very Close Calls