Astronomy Chapter 1 Word Scramble
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Question | Answer |
galaxy | great island of stars in space |
Milky Way | galaxy in which our solar system resides |
Local Group | a group of galaxies |
galaxy clusters | galaxies with more than a few dozen members |
super cluster | a region of tightly packed galaxies |
universe | the sum total of all matter and energy |
expanding | average distances between galaxies increase with time |
Big Bang | the beginning of expansion - 14 billion years ago |
Shape of Orbits | Elliptical |
What type of objects orbit. | Smaller objects orbit bigger objects. Planets, comets, asteroids and meteoroids orbit the sun. Moons orbits planets or dwarf planets. |
speed of light | 300,000 km per sec |
light year | distance light travels in a year - 6 trillion miles |
fact of light | the farther away we look in distance, the further back we look in time |
Orion Nebula | a giant cloud in which stars and planets are forming |
Closest Galaxy | Magellanic Cloud |
age of universe | 14 billion years |
observable universe | the portion of the universe that we can observe |
definition of planet | 1) orbits around a star 2) round shape 3) clear neighborhood around orbit 4) Is not a moon |
number of stars | more than 100 billion |
Objects don't leave their orbit because | the gravity between the object and the object being orbited. Example: Star and Planet |
astronomical unit | Earth's average orbital distance - 93 million miles |
Objects don't crash into the object they orbit because | the orbiting object's inertia |
Inertia is | Is caused by having mass and is the tendency of an object to resist a change in motion. |
Closest star to Earth besides our Sun | Proxima Centauri |
Regions in our solar system | Inner planets, asteroid belt, outer planets, Kuiper Belt, Oort Cloud. |
As you move farther from an object it's size becomes but the actual size doesn't change. | Smaller. |
Comets | Made of frozen gases, rock and cosmic dust. Located in the Kuiper belt and Oort Cloud. Range in size from 5km-100km |
Asteroids | Made of rock, iron, nickel, clay, silicate, stone. Range from 10m to 530km. Found mostly in asteroid belt located between Mars and Jupiter. |
Meteor | Bright streak of light in the atmosphere of a planet or moon caused from a meteoroid burning up due to air resistance. Range in size to less to 10m and made of rock, iron , nickel, clay, silicate and stone. |
Meteorite | Made of rock, iron, nickel, clay, silicate, stone. Vary in size but usually less than 10m. Found on the surface of a planet or moon. |
Meteoroid | Made of rock, iron, nickel, clay, silicate, stone. Vary in size but less than 10m because come from asteroids. Found throughout our solar system. |
Created by:
sgw005
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