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The article presents an account of a scientific expedition to Lake Cheko, near the Tunguska river in Russia, to investigate the site of the Tunguska Event, an catastrophic explosion which took place in the Siberian wilderness on June 30, 1908, and is thought to have been caused by a large asteroid or comet entering the earth's atmosphere. INSETS: Was Lake Cheko Created by the Tunguska Event?;TRACKING A DEATH STAR.

The article presents the author's view on the probability for an asteroid or comet to hit the planet Earth as discussed during the 1995 International United Nations Conference on Near-Earth Objects. Topics addressed include asteroids' and comets' design and construction and historic instances of collision between asteroids and the Earth. Ways to prevent a crash between the Earth and an extraterrestrial object and the possible need of government funds for astronomic research are also reviewed.

The article discusses how the entry of space objects such as asteroids, comets and meteors on Earth may offer valuable information into the history and heritage of the planets. It describes the impact of the meteor fall at Chelyabinsk, Russia, the Barringer Meteor Crater in Arizona, and the appearance of comets Hartley and Halley. The sizes, composition and flows of the most common space rocks are also cited.

The article looks at research on the history of the solar system, focusing on the question of where the water on Earth originated. It explains why the scientific consensus has shifted from comets to asteroids hitting Earth as the source of its water, noting it initially formed as a rocky planet with no water. Topics include heavy water, or water containing deuterium, and the role of Jupiter and Saturn in causing the motion of asteroids and comets.

The article discusses research performed by physicist Paul Miller from the U.S. Lawrence Livermore National Laboratory on ways to avert a collision between various astronomical objects and the Earth. Particular attention is paid to nuclear explosions as means of deflecting and disrupting an asteroid's approach towards the Earth. Computer simulations are also reviewed as a tool for predicting an asteroid's possible impact after a collision. A future research on comets is discussed as well.

The article presents the author's insights regarding inner solar space governance. The author states that defense of the Earth against threats such as meteors, asteroids and comets would also require defense of Mars. He mentions that the rates of scientific progress must be considered which is bounded by intellectual development.

El artículo discute las posibles consecuencias de la colisión de objetos espaciales con la Tierra, así como las probabilidades científicas de que algunos de estos cuerpos cause la destrucción del planeta. Entre otros eventos de este tipo, se discute la caída de un meteorito en la ciudad de Cheliábinsk en Rusia en febrero de 2013, el cráter de Chicxulub en la península de Yucatán en México y otros meteoritos menores caídos en el país.

The article focuses on the role of energy flux density in the planetary defense system. It focuses on the development of systems associated with successive fuel sources. It mentions that the transportation is only one expression of a broader qualitative change. It also discusses the factors determining the ability to defend the planet.

The article discusses a period in Earth's history, called the Late Heavy Bombardment, occurring approximately four billion years ago in which planet Earth, the Moon, and other rocky worlds were bombarded with asteroids and comets. Topics include disagreement among astronomers on the exact timing of the event or its cause, images of the lunar craters on the farside and nearside of the Moon, planetary theories of the solar system's origin, and the origin of the bombarding material. INSETS: An altered model;The Nice Model.

Information about several topics discussed at "Space and Global Security of Humanity" held September, 2012 sponsored by organization International Global Monitoring Aerospace Systems (IGMASS) on the collaborative defense of the mankind from natural disasters is presented. Topics include seismic forecasting and detection of asteroids and comets to prevent collision with the Earth. The symposium featured several researchers including Benjamin Deniston, Jason Ross and L.N. Doda.

The article discusses what would happen if an asteroid collided with Earth. The impact of an asteroid on the planet depends on what makes up the asteroid, how big it is, and how fast it's traveling. The effects of the asteroid also depend on what it is composed of, which can typically be ice, iron, or stone.

The article focuses on the potential collision of an asteroid with the Earth. The work on the topic by the geophysicist Dallas Abbott is discussed in which she found evidence to suggest that asteroids have hit Earth which landed under the surface of water. Information about the formation of asteroids and comets is provided, and the work of the National Aeronautics and Space Administration (NASA) to prevent collisions with space rocks is also discussed.

Discusses the possibility that an asteroid or comet struck the Earth and wiped out 95 percent of life in the oceans. How this collision allegedly occurred before the extinction of the dinosaurs; Use of iridium and other elements to determine where and when the object struck the Earth.

Speculates about the possibility that an asteroid will collide with and destroy the earth. Evidence of previous impacts by asteroids or comets; Development of a detection system that will discover asteroids, plot their paths and predict whether they threaten the earth; Numbers of near-Earth objects.

Discusses the ecological implications an impact from asteroids and comets with Earth may result in. Description of the Meteor Crater at Colorado Plateau in northern Arizona; Velocity of the meteorite; Shock; Impact on Earth; Threat of future collisions.

Focuses on studies on the possible collisions of asteroids and comets with the Earth. Computation of the likelihood of such collisions and estimates of possible damages; Description of the types of global destructions that a collision might bring; Consequences to face when reporting an imminent asteroid or comet collision with the planet. INSET: The most dangerous rocks in space. by Stuart J. Goldman.

Focuses on the realism of comet or asteroid collisions with Earth portrayed in science fiction movies. Astronomical and austrautical elements of the movies' plots consulted with science advisors; Balance of truth and art essential in making science fiction films.

Discusses the destruction that may be caused by comets and asteroids hitting the surface of the Earth. Possibility of the formation of acid rain; Estimated amount of particles falling into the atmosphere of the earth everyday; Asteroids orbiting around the earth; Estimated number of asteroids and comets that may collide with the Earth.

Predicts that the asteroid will hit the Earth in the year 2005. How the asteroids has been spotted by the astronomers; Object that can cause a tremendous amount of damages; Differences between comets and asteroids; Study on how to stop asteroid or comet to hit the Earth; Options for deflecting an asteroid or comet than for destroying one; Why the scientists are opposed to the idea of using nuclear weapons for planetary defense.

Discusses the possible approach in forecasting if a comet or an asteroid is on a collision course with earth. Possible damages of comet or asteroid on earth; Two Hollywood movies which dramatized the near-earth object (NEO); Ways people can detect NEO. INSET: And still they come.

Offers suggestions on how to protect ourselves from the negative impact of cosmic collisions. Lethal consequences of asteroid and comet collisions; Disruption of a threatening impactor; Diversion of the course of an asteroid; Available methods to make changes in the velocity of asteroids.

Examines the possibility of the Earth colliding with an asteroid or a comet. Reference to the explosion of a fire ball in Russia in 1938; Reference to the motion picture `Armageddon'; Description of an asteroid and a comet; Comments from astronomer, Eleanor Helin of the Jet Propulsion Lab; Views of scientists, Michael Baillie of Queen's University in Northern Ireland. INSETS: Coming Soon To A Sky Near You Meteors!;'Reel' Science;Create Impact Craters.

Reports on considerations being made concerning how to protect the Earth against collisions with space objects such as comets or asteroids. Various methods of defense proposed; Kinetic blast; Solar sail; Lasers; Nuclear destruction; Redirection.

The article presents information on the Catalina Sky Survey and the Minor Planet Center, which work with the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts to monitor asteroids and comets which could collide with the Earth. In October 2008, asteroid 2008 TC[sub 3] was detected just 19 hours before crashing into the Sudanese desert. A larger asteroid could have released energy comparable to a nuclear bomb, and caused massive ecological devastation. Various possible ideas for preventing such impacts are discussed, but evacuation of the impact site may be the only option if such threats are not detected in time.

The article examines the possibility that an asteroid, or a near-Earth object, could hit the Earth. The article is part of a special section of the magazine in which factors of change concerning life on Earth are examined. The article notes that an event that could result in extinction of man is unlikely. A number of issues are discussed including the threat posed to the Earth by comets, U.S. government funding for near-Earth object research, and the measures that could be taken should an object be headed toward Earth.

This article presents information about the Panoramic Survey Telescope and Rapid Response System (Pan-Starrs) digital camera and how it will help to warn Earth's inhabitants of a possible collision with an asteroid or comet. The camera will look at the skies through the Pan-Starrs-1 telescope in Hawaii, looking for approaching objects and changes. Research is being conducted on the use of aircraft to alter object trajectories and avoid such collisions.

The article discusses the possibility of whether the impact of a comet or asteroid from space initiate the process of plate tectonics on the planet Earth. The author outlines the process of geological plate movement and states that scientists do not ultimately know what initially triggered the Earth's plate movement.

The article describes a theory suggested by scientists which claims that evidence about the earliest records of life on Earth could be found by collecting rock samples from the moon. Scientists believe that terrestrial meteorites, created by collisions with comets and asteroids, could have struck the moon and remained intact, offering information on the formation of Earth.

Reports on the discovery of buckminsterfullerenes, or buckyballs, on Earth. Thought that the extinction of creatures on Earth during a period called the Great Dying was due to the impact of an asteroid or a comet; Research of Luann Becker and colleagues from the University of Washington.

Comments on the small spending on asteroid research around the world. The motion picture `Deep Impact,'; Novel `Hammer of God,' by Arthur C. Clarke; Advice from experts including Carolyn Shoemaker and Gene Shoemaker, on cometary impacts, that the film makers used; Monitoring the threat from approaching asteroids and comets; Interest of the public that is high as of May 1998 due to the alarm over the asteroid XF11; The threat of a collision with an asteroid.

Reports on evidence gathered by Duncan Steel of the Anglo-Australian Observatory in Coonabarabran, New South Wales that suggests an explosion caused by an asteroid or comet might have devastated part of New Zealand in the historical past. When it might have occurred; Other possible cause; Legends about the event.

Informs that the US Department of Defense plans to research and analyze the potential devastation that could be caused by a so-called near-Earth object (NEO). Reasons for the new research and analysis; Facts about NEO agreed upon by a majority of the world's scientists working on asteroid and cometary research; Figures on NEO assumptions and intercept system alternatives.

The article discusses the origins of water. It comments on the combination of oxygen and hydrogen, exploring the role of the Big Bang and the stars. The possible role of comets and asteroids in delivering ice to earth is also addressed, and the author mentions research on forms of hydrogen found in asteroids.

Discusses scientific ideas about the possible collision of a wayward comet or asteroid with the earth, presented by planetary scientist Richard Binzel at a dinner hosted by the Planetary Society. Origin of the issue of near-earth objects; Explanation of the Torino Impact Hazard Scale, in which an object is assigned a value based in its collision probability; Career background of Binzel.