Stars
what does relative brightness mean?
relative brightness refers to how bright or dim something is compared to others, not how actually bright it is.
true or false:
the sun is the only star in our solar system
True:
it is the only star int eh solar system and one of billions in our galaxy
what do telescopes do?
they help scientists see stars and other objects in the sky.
What are stars?
a giant ball of hot, glowing gases
true of False:
gravity is different on other planets
true: gravity varies on other planets
True or false:
a star's actual brightness and its apparent brightness can be very different.
true. for example, a star can appear dim but actually be very bright because of how far away it is
When the sun goes down, why does the ground get cooler?
The sun's radiant engery is not shining on the ground, so there is less heat at night than during the day
what is a refracting telscope?
refracting telescope use lenses to collect and magnify visible light.
Define Light-year
the distance light travels in one year
which of the following is not an example of overcoming gravity:
a) a book falling to the ground
b) a rocket laughing into space
c) a car driving up a hill
What colors can stars be?
red, white, blue, yellow, and orange
What type of energy does the sun give off
radiant energy
what is a radio telescope?
collects and measures radio waves that objects in space send out. They help scientists find objects they cannot see.
What is a telescope?
a tool that makes distant objects appear closer, larger and easier to see
How does gravity affect earth?
gravity pulls things towards earth
A star's _______ is a result of its temperature.
color
The is a ______ colored sun, a ______ temperature star, and a _______ sized star.
1). yellow
2). medium
3.) medium
what is reflecting telescope?
they magnify light from distant object using mirrors.
Define Gravity
a force that pulls objects towards earth/each toher
true or false: the sun's gravity keeps the earth traveling around the sun
true
Light travels at _________ kilometers second.
300,000
Why does the sun appear so large to us on earth compared to other stars?
it is the closest to us
what is an optical telescope?
use lenses to gather and magnify and focus light
what is radiant energy
energy in the form of light and other similar waves that can affect temperature on earth
The pull of Earth's gravity is 6 times as strong as the pull of the moon's gravity. The means a ball that weighs 1 pound on the moon will weigh about 6 pounds of earth. If a dog weighs 9 pounds on the moon, how much would the same dog weigh on Earth?
The dog would weigh 54 pounds because 6 X 9 = 54