7-2 Scale of the Universe

In space, light travels at a speed of about 300,000,000 m/s. Which expresses that speed correctly in scientific notation?

• 300,000 km/s

• 3 x 10^9 m/s

• 3 x 10^8 m/s

• 3 x 10^7 m/s

Tags

NGSS.HS-PS4-1

A star is 9 x 10^12 meters from Earth. What is the number in expanded form?

• 900,000,000,000 meters

• 9,000,000,000,000 meters

• 90,000,000,000,000 meters

• 9.0 x 10^12 meters

After six months, an astronomer notices that star A moves a greater distance than star B. Which conclusion is correct?

• Star A is closer than star B

• Star A and star B are equally far away

• Star A is farther away than star B

• More observations are necessary to determine which star is farther away

A star looks like it's located one place in the sky in January and a different place in June. What is this phenomenon called?

• a light-year

• parallax

• refraction

• scientific notation

________________________________ uses powers of ten to write very large or very small numbers in short form

• AUs

• Scientific notation

• Interstellar physics

• Extremely efficient data system thingy

The __________________ is made up of all of space and everything in it

• universe

• solar system

• severalverse

• bifrost

A light-year is a measure of

• distance

• time

• velocity

• velociraptor

Astronomers use _________________ to measure the distance to the stars that are within several hundred light-years of Earth.

• parallax

• unilax

• Hertzsprung-Russell equation

• Theory of relativity

A light year is about

• 9.46 trillion kilometers

• 9.46 trillion years

• 300,000,000 m/s

• 300,000,000 km/s

Parallax is the apparent change of ____________________ of an object when you look at it from different places

• position

• displacement

• speed

• density