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Near-Earth object
Near-Earth objects (NEO) are
asteroids, comets and large
meteoroids whose orbit
intersects Earth's orbit and
which may therefore pose a
collision danger. Due to
their size and proximity,
NEOs are also more easily
... > full story
Meteorite
A meteorite is a small
extraterrestrial body that
impacts the Earth's surface.
While in space they are
called meteoroids, and while
falling through Earth's
atmosphere they are called
meteors. These are small
... > full story
Near-Earth asteroid
Near-Earth asteroids (NEAs)
are asteroids whose orbits
are close to Earth's orbit.
Some NEAs' orbits intersect
Earth's so they pose a
collision danger. On the
other hand, NEAs are most
easily accessible for
... > full story
Torino Scale
The Torino Scale is a method
for categorizing the impact
hazard associated with
near-Earth objects (NEOs)
such as asteroids and
comets. ... > full story
Browse Reference Articles
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Asteroid belt
The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. Despite popular imagery, the ... > more -
Comet Hale-Bopp
Comet Hale-Bopp was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades. It was visible to the naked eye for a record 18 months, twice as long ... > more -
Comet Shoemaker-Levy 9
Comet Shoemaker-Levy 9 (SL9, formally designated D/1993 F2) was a comet which collided with Jupiter in 1994, providing the first direct observation of the collision of two solar system ... > more -
Dysnomia (moon)
Dysnomia, is a moon of the dwarf planet Eris. The satellite is about 60 times fainter than Eris, and its diameter is estimated to be approximately eight times smaller. Astronomers now know that three ... > more -
Impact crater
An impact crater is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the ... > more -
Neptune's natural satellites
Neptune has 13 known moons. The largest by far is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. It took a hundred years to discover the second, Nereid. ... > more -
Outer space
Outer space, also simply called space, refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and ... > more
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