Asteroids. updated july 19, 2009. 2. Titius-Bode Law (1766). The distances between the planets gets bigger as you go out. Titius & Bode came up with a law that predicted the size of the orbits BIG gap between Mars (1.6 AU) & Jupiter (5.2 AU). Predict planet at 2.8 AU.
updated july 19, 2009
Johann Daniel Titius( 1729 – 1796)
Johann Elert Bode (1747 - 1826)
13,500 have official names.
visited a few
Several small bodies
of Mars, and a
shown in their
Asteroid Ida has its own little moon, Dactyl, which is
1.5 km in diameter
Ida is 56 km long
Gaspra is 18 km long
Mars’ satellite Phobos
Phobos is cratered, but has an overall smooth surface.
Note the long grooves and chains of craters.
The chains of craters are probably caused by gas
coming out of the interior of Phobos.
The other craters are from impacts.
Phobos is probably an asteroid.
Asteroid #216 Kleopatra, mostly made of metal, mapped by reflection of radar signals (2000) 217x94 km.
Itokawa is about 500 meters long – it is a Near-Earth asteroid (NEA)
A landing device
will grab a sample
of Itokawa and
return it to Earth.
This will be the
Why aren’t there
any impact craters
on this asteroid ?
(I have no idea !)
asteroid, 433 Eros,
was visited by an
The spacecraft was
(Near Earth Asteroid
NEAR took pictures all the way down to the surface.
This frame shows an area about the size of our classroom.
Boulders in the bottom of a
depression on Eros’ surface.
hit the planets and
sometimes fall to
the ground as
of other worlds.
The 1 mile diameter Barringer Crater (Arizona) was probably created by a 45 meter object, 50,000 years ago.