Page 4 of 5 • 1, 2, 3, 4, 5
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:23 pm
According to National Geographic, there are two hypotheses for this event: an asteroid or comet hitting the Earth, or a huge volcano eruption. The case for an asteroid comes from a layer of iridium (a rare element on Earth, but not in meteorites) that is found all over the world, and a crater called Chicxulub in Mexico’s Yucatan Peninsula that is about 65 million years old.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:23 pm
An asteroid impact around 65 million years ago caused a chain reaction that led to the extinction of the dinosaurs and affected all life on Earth, according to scientists.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
An asteroid about .15 kilometers (.1 miles) in width is believed to have exploded over Siberia, causing damage within a radius of hundreds of kilometers (miles).
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
Most asteroids are irregular in shape because they are too small to exert enough gravitational pull to become spherical in shape.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
Iridium, however, is also found inside the Earth, which lends credence to some theories that it was volcanoes instead. In either case.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
Some asteroids are blown out comets. When the ice is gone, all that remains is the rocky material.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
At least one asteroid has rings. Called Chariklo, scientists made the surprise discovery in 2013 when they watched it pass in front of a star. The asteroid made the background star “blink” a few times, which led to the discovery that two rings are surrounding the asteroid.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
A meteoroid (piece of asteroid) the size of a car falls into the Earth’s atmosphere on average once every year. This creates a bright fireball effect, but it usually burns up in the atmosphere before it reaches the ground.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:24 pm
Asteroids are amazing celestial objects that hang in our Solar System. There is a whole reservoir of these objects hanging between Mars and Jupiter. How many of them are there? Millions of them! This reservoir is known as asteroid belt.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids are small, rocky solar system bodies that populate interplanetary space out to the orbit of Jupiter. There are millions of them, and they are often grouped by their composition. The planetary science community refers to them as minor planets, a general term applied to solar system bodies smaller than moons.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids are not new or sudden creations. They are old, very old! In fact, they are as old as our planet Earth or any other planet in our Solar System. These asteroids share a common birth with our planets. About 4.6 billion years ago when our Solar System was forming, objects would collide with each other, sticking together to form larger objects and eventually forming planets and satellites.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids are mainly made of materials left over from the formation of the inner solar system words. Most of them orbit the Sun between Mars and Jupiter, although there are groups of them that orbit closer.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
As far as chemical composition of asteroids is concerned, they are home to wide range of minerals, metals and other substances. Asteroids that were formed by breaking away from some planets inherit a similar chemical composition as the planets.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids come in three composition classes. C-types (chondrites) are made of clay and silicate rocks. S-types are the so-called “stony” asteroids and are made mostly of silicate rocks and nickel-iron mixtures. M-types are metallic nickel-iron. These categories indicate how far from the Sun they formed in the early solar system.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
The chemical composition of asteroids undergoes changes while orbiting the sun. This happens because of various chemical reactions that take place. Asteroids that are far from the sun usually have silicate rock composition. Those that are close usually are carbonaceous.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids are clues to the formation of the rocky planets of our solar system. The objects we see today are leftover from a time when the solar system formed 4.5 billion years ago.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
There are metallic asteroids present as well. They are mostly made of iron but may also contain other metals like platinum, gold, palladium, iridium etc. There may be some asteroids that have half metallic and half silicate composition.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids aren’t the only things that hit Earth. Each day, more than 100 tons of material from asteroids and comets falls toward Earth. Most of it is destroyed by friction as it passes through our atmosphere. If something DOES hit the ground, it is known as a meteorite.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:25 pm
Asteroids often collide with each other. Upon collision, smaller ones can break and end up as dust on the larger ones. This dust is known as regolith. It is not necessary that asteroids will collide only with other asteroids. Any object that crosses their path can collide.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
While asteroid impacts were more common in the past, they aren’t as frequent today.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
Asteroids are pretty dangerous. Collision between asteroids can throw them out of their orbits and set them on a collision course with planets. Earth is not immune to such impacts. As a matter of fact, collision between asteroids and planets shape the very fabric of a planet. Earth as experienced numerous asteroid collisions ever since it birth.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
An asteroid impact some 65 million years ago contributed to the extinction of the dinosaurs. (It was one of several factors that affected all life on Earth at that time.)
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
Collision of asteroids with planets is known as impact event. An impact event can shape the atmosphere of a planet and change its climate. These impact events can be extinction-level events. For instance, it was an asteroid that led to the extinction of dinosaurs some 65 million years ago.
- Dhruv singhaniya
- Posts : 12549
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
Earth suffers an impact from an object the size of a football field about once every 2,000 years.
- deepika2029
- Posts : 10954
Join date : 2019-01-07
Re: What is an Asteroid ?
Tue Jan 15, 2019 4:26 pm
Those asteroids that crash directly on earth’s surface leave a crater and destroy everything in the surrounding area. The extent of damage caused will depend on the size of the asteroid. A single very large asteroid is capable of wiping out life from entire earth. Those that do not crash but rather explode a few kilometers above the surface are also capable of causing immense damage because of the heat and shockwave produced by the explosion.
Page 4 of 5 • 1, 2, 3, 4, 5
Permissions in this forum:
You cannot reply to topics in this forum
|
|