Space
WHAT is a light-year> *Not the actual distance*
The distance light travels in 1 year
Which astronomical model of the solar system is focused on the EARTH at the center and everything revolving around it?
the geocentric model
The name of the galaxy we live in.
The Milky Way
Define the solar system
the sun and all of the planets and other bodies that travel around it
Write 8.1 × 10⁻⁵ in standard form
0.000081
How far is 1 lightyear?
6 trillion miles or 10,000,000,000 km.
Which astronomical model of the solar system is focused on the SUN at the center and everything revolving around it?
the heliocentric model
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
A galaxy.
What are the 4 inner planets called?
the rocky planets
Write 8,430 in scientific notation
8.43 × 10³
WHAT is an astronomical unit (AU)?
the distance from the center of the Earth to the center of the sun
Which early Greek philosopher is known for his belief in the geocentric model?
Aristotle or Plotemy
What are the 3 types of galaxies?
Spiral, Elliptical, Irregular
What are the 4 outer planets called?
the gas giants
Write 0.0000000183 in scientific notation
1.83 × 10⁻⁸
Which astronomer is known for proposing the heliocentric system of our solar system?
Nicolaus Copernicus
What is the closest galaxy to us?
Andromeda
What holds the solar system together?
Gravity
Write 7.79 × 10⁶ in standard form
7,790,000
Would you measure the distance to the moon in light-years or light-seconds?
Light-seconds.
What is the current model of the solar system that is widely accepted in modern astronomy?
the heliocentric model
How far across is the Milky Way?
About 100,000 light-years
What is another name for a shooting star?
A meteor
Why do scientists use scientific notation?
To describe sizes and distances in the universe since those numbers are often very small or very large