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Comets
Comets are small solar system bodies that orbit around the Sun. They have a tail (trail of light) when traveling in space.
1,186 Questions
Will the Apophis "God of Chaos" asteroid hit the Earth in 2029?
Nothing is 100 percent guaranteed in astronomy, but scientists don’t expect the asteroid 99942-Apophis to come into contact with the Earth (or any other celestial bodies in our solar system, for that matter).
A blog post from NASA’s Jet Propulsion Laboratory (JPL) at the California Institute of Technology notes that on Friday, April 13, 2029, 99942-Apophis will “cruise harmlessly by Earth, about 19,000 miles (31,000 kilometers) above the surface.”
You read that right: An asteroid will come incredibly close to the Earth on Friday the 13th. If you’re superstitious, that seems like bad news, but astronomers aren’t worried.
“That’s within the distance [of] some of our spacecraft that orbit Earth,” the blog notes. “The international asteroid research community couldn't be more excited.”
Note that they use the word “excited,” not “terrified.”
"The Apophis close approach in 2029 will be an incredible opportunity for science," Marina Brozović, a radar scientist at JPL, said in a statement. "We'll observe the asteroid with both optical and radar telescopes. With radar observations, we might be able to see surface details that are only a few meters in size."
Without radar, telescopes, or other tools, Apophis will still be impressive. It will be visible to the naked eye and will look like a star moving across the sky. From our perspective, it will become visible above Australia, then move across the Atlantic Ocean, reaching the U.S. West Coast in the early hours of the evening.
Apophis was discovered in June 2004, and later that year, a group of Australian astronomers spotted it a second time and calculated a 2.7 percent chance of a collision with Earth. However, subsequent calculations have ruled out that possibility for the 2029 flyby.
What about future flybys? Speaking to Newsweek, astronomer Davide Farnocchia put the chances of a collision after 2060 at “less than 1 in 100,000.” That’s still incredibly close by the standards of astronomy, but it’s not something to worry about.
If Apophis did come into contact with Earth, it could cause devastating damage, but at 1,110-feet wide, it’s not large enough to cause a global extinction. Asteroids only pose an existential threat to life on Earth when they’re several miles wide; at those sizes, they could throw up enough dust from the planet’s surface to block out sunlight, preventing plant growth and causing global temperature changes. Scientists believe that the object that contributed to the extinction of dinosaurs was about seven to eight miles wide.
Apophis isn’t a threat at all—at least, it won’t be in 2029. If you’ve got clear skies that night, count yourself lucky and watch the show (and don’t worry about taking out extra insurance).
Halley's Comet actually comes around every year. Humans enjoy loooking at the beautiful light show. The reason why Halley's Comet is so famous is that light show was the first comet seen that was reecorded.
The planets were originally giant comets captured by the sun?
Our current theory of the formation of our solar system is that the planets formed more or less in their present orbits. We do not believe that the planets (with the exception of Pluto) were "captured" by the Sun's gravity.
Which electrical goods are sold by Comet?
Although all Comet Group stores were shut down on 18 December 2012, they sold various electronics. Examples of their merchandise include digital cameras and televisions.
Comet which seen in every 73 years?
That is Halley's comet, named after English astronomer Edmond Halley,
What was the comet possibly seen by the Mesopotamians?
no non of the people in Mesopotamia saw the comet
How long can the 'vomit comet' aircraft produce the conditions of free fall?
25 seconds I thought it would be longer. The free-fall speed of the human body is 120mph. So, the aircraft has to dive and reach a vertical speed of 120mph. If you run the calculations with the a/c starting at 45,000 feet altitude, you would expect the aircraft could "fall" for 4 minutes. But, of course, you have to allow time for the aircraft to pull out of the dive and a little margin for safety. Then there are structural limitations on the aircraft. What is amazing is that the weight-less scenes in the movie "Apollo 13" were filmed using a "vomit comet". This required them to fly over 58,000 dives. The weightlessness is not caused by diving, but by flying upward into a curve (I believe it is called a hyperbolic curve). This curve essentially imitates what a body would do projected upward into a similar curve. I'm sure it's a great deal safer and less stressful (on body and plane) than any "dive" method.
Zero G conditions are achieved just before, during, and after the top of the above mentioned curve. For a informative diagram of this phenomena see the Web Link to the left.
What are the superstitions related to comet and asteroid in japan?
In Japan, the superstitions that are related to comet and asteroid is that it is death calling. People therefore are usually afraid to see the comets and asteroids.
How fast do brainwaves travel?
The fastest nerve conducts an impulse at 120 metres per second. However transmission speed is related to diameter, and so nerves with a smaller diameter conduct impulses at a much slower speed. In general, the conduction velocity is approximately equal to 6 x axon diameter in micrometres. The constant value of 6 is referred to as the Hursh factor.
Meteor "showers" happen when the Earth passes through the path of an old or extinct comet. As the comet approaches the Sun each pass, the frozen gasses of the nucleus vaporize, and the gas then carries away some dust and sand into space. But it's not pushed very far; the dust and gas are still orbiting the Sun ALMOST in the same orbit as the comet does.
So after a thousand or more orbits, there gets to be a dusty path all the way around the Sun. When the Earth passes through (or near) the dusty path, we get grains of dust and sand striking the Earth, falling into the atmosphere, and burning up - a "shower" of meteors. The path doesn't change; it only intersects the Earth's orbit at one point, and the Earth hits that point just about the same date each year.
And so we get regular "periodic" meteor "showers".
When a comet breaks apart can a dust cloud form a meteoroid?
Yes. Old and extinct comets are probably the source of most of the "meteor showers" that we see over the year. It's not that the dust forms something else; the dust ARE the meteoroids.
Bailey's Comets - 1973 Skateroo to the Carlsbad Clue To Win or Toulouse 1-1 was released on:
USA: 9 September 1973
What is the scientific evidence of superstitions about comets asteroids and meteors?
If something is considered a "superstition", that means it is UNSCIENTIFIC. Once there is evidence that something is true, it will no longer be generally considered a superstition.
Does the Halley's Comet ever leave our Solar System?
No. Halley's Comet barely gets past the orbit of Neptune, and not by much. It is well short of reaching into the Kuiper Belt.
Spherical region of comets surronding the solar system-what is it called?
The outer Oort cloud. (The inner Oort cloud is believed to be disk-shaped.)
Is a oort cloud created by solar wind?
No. The Oort Cloud is "leftover" mass from the formation of the Sun and the planets.
What did seven century astronomer Edmund halley notice about the comet later named after him?
Halley's Comet is a short-period comet; we can predict that it will return to the inner solar system within our lifetimes, and several times in recent history. Most other comets are either long-period and will not return for centuries, or will never again be visible.
Sometimes it is very bright; sometimes it is a "fizzle". It is this element of reassuringly-predictable repeating mystery that makes it noteworthy.
Are comets made mostly up of rock and metal?
Comets are mostly made up of ice. They usually have a metallic core high in nickel. The tail of a comet is actually the ice melting as it passes a heat source.
