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No Strings Attached
- Author:
-
David Morrison
- Subject:
- Science and Technology
- Institution Name:
- NASA
- Collection:
-
NASA
- Grade Level:
- Secondary
- Abstract:
At the end of 2003, there were 2600 known Near Earth Asteroids (NEAs), and of these 691 are brighter than absolute magnitude, which is taken to correspond to a diameter of 1 kilometer or more. Of these, 131 are classed as PHAs (potentially hazardous asteroids) larger than 1 km. This site describes the potentially devastating effects of a collision between Earth and a large meteor or asteroid. It also describes the Spaceguard Survey, which is an initiative to locate and catalog as many potentially hazardous NEAs as possible. Other parts of the site include: a news archive, bibliography, catalog of near earth objects, image gallery, and links to related sites.
- Course Type:
- Learning Module
- Languages:
- English
- Material Type:
- Readings
- Media Format:
- Graphics/Photos, Text/HTML
- Conditions of Use:
-
Public Domain
NASA still images; audio files; video; and computer files used in the rendition of 3-dimensional models, such as texture maps and polygon data in any format, generally are not copyrighted. You may use NASA imagery, video, audio, and data files used for the rendition of 3-dimensional models for educational or informational purposes, including photo collections, textbooks, public exhibits, computer graphical simulations, and Internet Web pages. This general permission extends to personal Web pages.
No restrictions on your remixing, redistributing, or making derivative works.
Give credit to the author, as required.
Your remixing, redistributing, or making derivatives works comes with some
restrictions, including how it is shared.
Your redistributing comes with some restrictions. Do not remix or make
derivative works.
Copyrighted materials, available under Fair Use and the TEACH Act for US-based
educators, or other custom arrangements. Go to the resource provider to see
their individual restrictions.
Asteroid and Comet Impact Hazards
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