Brightness of Stars
Why does the Sun appear brighter than other stars?
The Sun is closer to Earth than other stars.
The ________________________ affects the shadow direction and length.
location of the Sun in the sky
What effect does the force of gravity have on the shape of the Earth?
The force of gravity pulls all objects, including the mass of the Earth, toward the center of Earth, causing Earth's surface to curve.
gravity
the force that pulls objects toward the center of the Earth
orbit
to move around an object in space as a result of a gravitational pull
True or false: stars give off their own light.
True
At what time would the shadow of this bench likely be the longest?
A. 11:00 AM B. 1:00 PM C. 5:00 PM D. 1:00 AM
C. 5:00 PM
Buoyancy is an upward force on an object submerged in a fluid, such as water or air. This force causes objects to float, such as boats or lifejackets.
True or false: The force of buoyancy works against the force of gravity.
True
air resistance
a force that is caused by air and works against gravity
apparent brightness
brightness of stars, specifically when measured from the viewpoint of Earth
estimate the distance between the Sun and Earth?
Less than 1 light year
explain why different constellations are visible at different times of the year
As the Earth orbits around the Sun, different stars are visible to us.
Omar is planning an experiment where he will drop various items from the top of his stairs and keep track of how long each item takes to fall. Which object would be more affected by air resistance?
A. a sheet of paper wadded into a ball
B. a flat sheet of paper
a flat sheet of paper
spherical
rounded
celestial objects
natural objects that are located outside of Earth’s atmosphere, such as stars, planets, and asteroids
Explain the apparent brightness of stars?
Brighter stars are closer to Earth.
Stella notices that where she lives, there is more daylight during the summer than in the winter.
why?
Earth’s axis is tilted, which causes the days to be longer in the summer and shorter in the winter (in the Northern Hemisphere).
Sir Isaac Newton discovered gravity when he saw an apple fall to the ground and wondered why it fell downwards instead of floating up into the sky. He determined that there must be a force that pulls objects towards _______________. He named this force gravity.
the center of the Earth
constellations
groups of stars that people have imagined to represent different shapes or objects
axis
an imaginary line that runs through the center of the planet