Physical Science chapter 14 and 15
Microwave radiation from space, measurements of the expansion of the universe, the age of the oldest stars in the Milky Way galaxy, and ratios of radioactive decay products all indicate that the universe is about how old?
13.7 billion years
How many moons orbit Mars?
2
The mass of the sun is how much larger than all of the other planets, moons, asteroids, and other bodies in the solar system?
700 times larger
What separates the terrestrial planets from the giant planets?
Asteroid belt
A referent system that can be used to locate objects in the sky is the...
Celestial sphere
The belt of asteroids between Mars and Jupiter is probably...
Clumps of matter that condensed from the accretion disk but never got together as a planet
In which part of a newborn star does the nuclear fusion take place?
Core
Venus "shines" because it is...
Covered with clouds that reflect sunlight
Outer space is mostly...
Empty space
The basic unit of a universe is a...
Galaxy
A galaxy is held together by...
Gravitational attraction
The temperature-luminosity graph used to classify stars was developed by...
Hertzsprung and Russell
Planets in our solar system are classified according to all of the following characteristics except...
Inhabitants
What is the largest planet in our solar system?
Jupiter
Meteorites are classified into all of the following groups except...
Lead
Short-period comets have orbital periods of...
Less than 200 years
Distance in outer space is measured in terms of...
Light years
Where does our sun belong based on the Hertzsprung-Russel classification of stars?
Main sequence
The day on which planet is about the same time period as a day on Earth?
Mars
The lifetime of a star depends on its...
Mass
The planet that has the shortest "year" among the eight planets is...
Mercury
The planets that are not giants are...
Mercury, Venus, Earth, Mars
A shooting star is a...
Meteor
A small body from space that falls on the surface of the Earth is a...
Meteoroid
Remnants of comets and asteroids found in space are called...
Meteoroids
The name of our galaxy is the...
Milky Way (spiral shape with black hole)
What is the outermost planet?
Neptune
Area of the solar system where long-period comets originate is the...
Oort cloud
The planet with the lowest average density, which is less than that of liquid water, is...
Saturn
What type of planets are Mercury, Venus, Earth, and Mars?
Terrestrial planets
Which of the following stars would have the longer life spans?
The less massive
A day on which planet is longer than a year on that planet?
Venus
What planet is called the morning star and the evening star, depending on its position with respect to the sun?
Venus
Our sun is...
an average star, considering mass and age