The distance from Earth to the Sun is about 150,000,000 km. What abbreviation do scientists use to describe this distance? OPTIONS:
- meters per second (m/s)
- light-year (ly)
- astronomical unit (AU)
- electromagnetic unit (EMU)
A: astronomical unit (AU)

The Sun is a medium-sized star and is expected to continue to perform nuclear fusion for five billion years. What is most likely to be the final stage of the Sun? OPTIONS:
- supernova
- supergiant
- neutron star
- white dwarf
A: white dwarf

A student reaches one hand into a bag filled with smooth objects. The student feels the objects but does not look into the bag. Which property of the objects can the student most likely identify? OPTIONS:
- shape
- color
- ability to reflect light
- ability to conduct electricity
A: shape

Which observation of a plant supports the inference that photosynthesis can take place? OPTIONS:
- a strong, sweet smell
- a dry, rough texture
- a green color
- a smooth stem
A:
a green color