Wednesday, July 24, 2019, 9:30 pm – If you live near Bancroft, Ontario, look for space rocks!
In the early hours of Wednesday, July 24th, the sky is above us Southern Ontario was lit as brightly as the full moon when a bright fireball flew overhead.
According to NASA records, the meteorite that caused this fireball – an approximately 30 cm wide rock from space – crashed into the atmosphere with an energy of more than half a kiloton of TNT. It then went west of Toronto past Peterborough and north west of Bancroft, Ontario.
See below how this bright fireball flashes through the sky.
: Do you think you have found a meteorite? Here's what you learn
Map of southern Ontario showing the trajectory of the Bancroft fireball. Credit: NASA
According to Peter Brown, professor of Western University, the fireball was finally out there – slowed down enough to keep the air from compressing to the point where it glows – parts of the meteorite possibly survived to hit the ground!
"This fireball has probably dropped a small number of meteorites in the Bancroft area, especially near the small town of Cardiff, and we suspect that meteorites made it to the bottom because the fireball is very deep in the atmosphere to the west Bancroft ended and slowed significantly, which is a good indication that material has survived, "says Brown.
Close-up map of the end of the Bancroft Fireball trajectory showing the region where meteorites were possibly found. Credit: NASA
If you are reading this article and live in the area north of Peterborough, Ontario, west of Bancroft, it may be worth your while to look for meteorites.
Peter Brown published a map with the best addresses on his Twitter account.
If anyone finds something that he believes is a meteorite, it is certainly the best way to find out about the Royal Ontario Museum, during one of their clinics identifying rocks, gems, minerals, fossils, and meteorites.
WHAT IS HERE?
Every day, several tons of dust, ice and rocks are released from the Earth's atmosphere as the planet moves through space. Much of it is just tiny particles of dust and ice. A small part of it consists of slightly larger parts, such as grains of sand, pebbles and gravel – the larger the size, the less there are.
Every now and then, maybe a few times a month, something bigger gets in our way as the earth flies around the sun. These larger meteoroids vary in size, from the size of a golf ball to giant asteroids several meters in diameter. The Chelyabinsk asteroid had a diameter of about 20 meters from February 2013!
An Introduction to Meteoroids, Meteors and Meteorites. Credits: Scott Sutherland / NASA JPL / Dsterid NASA Earth Observatory
When one of these meteoroids hits the surface of the atmosphere, it moves at a speed of tens of thousands of miles per hour and compresses the air into it their speed very fast way, so much so that the air heats up to glow incandescent! This glow is the & # 39; meteor & # 39; we see hovering high above the ground through the air. Meanwhile, the air pushes back on the meteorite. it slows down and sometimes exerts enough force on the meteorite to smash it! Once the meteorite slows to the top Where it can no longer heat the air until it glows, the meteor flashes off.
For larger objects this sometimes ends very abruptly in an explosion, as the meteoroid breaks. This is known as a bolide.
The bigger a meteorite is, the farther it can plunge into our atmosphere and still survive. In this way, the object or broken parts of it can reach the ground as meteorites.
Related: Would you like to find a meteorite? Expert Geoff Notkin tells us how!
Meteorites are usually not hot when they fall to earth. They are pretty cold. As meteoroids fly around in space, they tend to cool down to extremely cold temperatures. So they can not be identified by burning or smoking.
Here's what you need to look for to find a meteorite:
- Magnetic: Because of the high metal content, most meteorites adhere to a magnet (the moon and Mars have less iron and therefore do not attract a magnet.]  Fusion crust: The outer surface of a meteorite has a very thin, shiny dark crust ranging from gray to brown to black, while the inner surface attracts a magnet and has a much lighter color
- Regmaglypt: Some larger meteorites, especially iron meteorites , surface impressions resembling a thumbprint pressed into the putty are rarely spherical or symmetrical (and some fusion crusts may be rough to the touch).
- Fragments: Larger meteorites often break apart as they pass through the atmosphere, and thus become as irregularly shaped fragments found only with the fusion crust a part of their surface Interior Coat: Iron meteorites will shine like steel inside, stone iron will be the same, with small gem-like pieces embedded in the metal, while stones will either be largely uniform or look like tiny balls all packed together are  Meteorite Mistakes: There are many natural and artificial rocks on Earth that can share the properties of meteorites. Hematite, magnetite and mining or industrial slag are often confused with meteorites. If it is not magnetic, has no fusion crust, has tiny holes in the surface, or consists of layers of material, it is most likely a meteorite defect.
Sources: Western University | NASA | With files from The Weather Network