Unit 7 Review

A spacecraft traveled from Earth to Jupiter in several years. Based on this, what is a reasonable estimate for a spacecraft to reach venus?

• A few minutes

• A few hours

• Several months

• Several decades

An astronomer observes a large collection of stars, gas, and dust arranged in a spiral shape. What is the astronomer most likely looking at?

• A nebula

• A galaxy

• A planetary system

• A asteroid field

A scientist analyze the relationship between the mass of a planet and its orbital velocity around the Sun. Which of the following statements is correct ?

• Planets with greater mass orbit at faster speed.

• Planets with less mass orbit at faster speed.

• Planets closer to the Sun orbit faster

• Planets farther from the Sun orbit faster.

If a star's absolute brightness changes, which of the following is least likely to change?

• ITs absolute magnitude

• Its color

• The energy it emits

• Its nuclear fusion rate

How does the composition of an asteroid compare to that of a star?

• Both contain large amounts of hydrogen and helium

• Both are primarily composed of ice and dust

• Asteroids are made of rock and metal, while stars are made of gas

• Asteroids are burning rock, while stars are frozen gas.

A scientist send radio waves towards four celestial objects and measure how long it takes for the signals to return. Which object will likely take the longest to send back a signal?

• A planets in the solar system

• A moon orbiting jupiter

• A star in nearby galaxy

• An asteroid in the asteroid belt

If the Sun were the size of a soccer ball in a model, how big would Earth be?

• The size of a grain of sand

• The size of a marble

• The size of a basketball

• The size of a beach ball

Which characteristic would be most useful in classifying a newly discovered star?

• Color, temperature, luminosity, and mass

• Temperature, solar activity, planet count, and brightness

• Temperature, planet size, solar flares, and distance from Earth

• Color, number of moons, distance from the milky way , and dark spots

The milky way galaxy contains of billions of stars, but appear as a faint glow in the night sky, Which statement best explains this?

• The milky way consists of only a few hundreds stars

• the stars in the milky way are too small to be seen

• The milky way consists of billions of stars, but most are too far to see individually.

• The stars in the milky way emit very little light

What is the correct color of a star from coldest to hottest?

• Blue, White Yellow, Red

• Red, Blue,Yellow,White

• Red, Yellow, White, Blue

• Red, White, Yellow, Blue