Stars and Galaxies
What force keeps galaxies together in space?
Gravity
If in a scale model of the solar system, 1 centimeter=1 million kilometers, and the Earth is 149 million kilometers to the sun, how many centimeters away would the model of the Earth be from the model of the sun?
149 centimeters
The 4 outer planets are referred to as the __________ ___________ as they are made mostly of hydrogen and helium
Gas Giants
The motion that we are able to view from Earth of an object in space is called the object's _____________ motion
apparent
Why would a human weigh less on the moon than on Earth?
Weight depends on gravity
What is larger, a star system or a star cluster?
Star cluster
What is 1 AU equivalent to?
Venus is the hottest planet but it is not the closest to the sun, why?
What space object is made mostly of ice and rock and has a long elliptical orbit around the sun?
Comets
Telescopes that collect and focus VISIBLE light are called _________________ telescopes
Optical
Which type of galaxy is the Milky Way?
Spiral
The diameter of Earth is 12,756 km. If I want to create a scale model of Earth using the scale factor of 1 cm=10,000 km, what would the diameter of the scale model of Earth be?
1.3 cm
What is the main difference between asteroids and meteoroids?
Meteoroids are smaller
Which general term is used to describe an object that orbits another object?
Hint: Moon's are considered this
Satellite
A man-made object that carries specific scientific instruments without a human crew is called a:
Space probe
What type of galaxy contains older stars due to the lack of dust and gas within the galaxy?
elliptical
Earth's orbit is 149 million km to the sun. Jupiter is 778 million km to the sun. Based on this fact, how many AU is Jupiter away from the sun? Round to the nearest tenth.
5.2 AU
In which layer of the sun does the sun produce its energy?
The core
a meteoroid becomes a meteor when it...
Goes into Earth's atmosphere and burns up
Star systems that have two stars are called _________ stars
Binary or Double
Which type of galaxies contain young bright stars due to having large amount of gas and dust within them?
Irregular
In a scale model of the solar system, Earth is 20 centimeters away from the sun. Earth is actually 149 million km from the sun. Mars is 401 million km from the sun. In the same scale model as previously mentioned, how far away would Mars be from the sun?
54 centimeters
There are 3 requirements for an object to be considered a planet:
1.) They have to be rounded by their own gravity
2.) They have to orbit the sun
What is the final requirement?
They have to clear their orbital path
To determine the distance from Earth to nearby stars, astronomers can use ____________, or the apparent motion of the object against background stars
What two forces keep objects in the solar system in orbit around each other?
Inertia and Gravity