The reference plane for the horizon system is the horizon and the reference point is the vernal equinox
No - the reference point is the north point
The hour angle of a star is measured from the local meridian towards the east to the foot of the meridia
Meteorites which are half iron and half silicates are called _.
Stony-iron meteorites consist of mixtures of _ .
iron and silicates
Most meteorites probably come from Apollo-type asteroids which have collided with the Earth
The cosmic debris between the planets is known as the meteoritic complex.
Comets are rocky-metallic worlds ranging from a few hundred meters or less up to 1,000 km in diameter.
A small nebulosity with one or more bright spots and a
The velocity of a star relative to the local standard of rest is termed its _
The peculiar velocity of a star is _.
C. Its velocity relative to the local standard of rest
Stars with high velocities (relative to the Sun) usually have
All the spherical coordinate systems that we studied in this unit were based upon choosing _.
B. A reference plane
C. A reference direction
The terrestrial latitude of Columbia, SC Is _ .
B. 34 degrees North
The longitude of Greenwich, UK, Is abo
The length of an object is a(n) _ measure.
The difference in direction between 2 points as measured from a specified third point is a _.
A. Angular measure
The symbol (') stands for _.
B. Second of arc
When a circle is divided into 360 eq
NOTICE THIS UNIT REQUIRES A LAB FOR CREDIT
In 1750, Thomas Wright proposed that the galaxy has _.
B. a slab-like arrangement
Herschel, in the late 1700's and early 1800's, counted many stars in the Milky
The first astronomer to put the
Wien's law is not something which we must explain in a proper origin theory for the solar
A theory of the origin of the solar system must explain Kepler's laws.
A theory of the origin of the solar system need not ex
When the Earth collides with swarms of many meteoroids moving together in space, we have _
The point, on the celestial sphere, from which meteors in a shower appear to diverge, is termed the _ of the shower.
The source for meteor sh
Which theory of the spiral arms could be described by - waves traveling around
the galactic center which stars, gas, and dust enter; are compressed leading
to star formation; the stars and other material are left behind as the wave