-
Field of view
the region you can see in am image
-
Scientific notation
the system of recording very large or very small numbers by using the power of ten
-
planet
a small nonluminous body that shines by reflected light
-
star
a globe of gas held together by its own gravity and supported by the internal pressure of its hot gasses, which generate energy by nuclear fusion
-
astronomical unit
the average distance from Earth to the sun:
equation:
1.5 x 108 km, or 93 x 106 mi
-
light year (ly)
a unit of distance; the distance light travels in one year
1013 km or 63,000 AU
-
galaxy
a large system of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass
-
Milky Way Galaxy
the spiral galaxy containing our sun; it is visible in the night sky as the Milk Way
-
Spiral arm
a long spiral pattern of bright stars, star clusters, gas, and dust. Such arms extend from the center to the edge of the disk of spiral galaxies
|
|
