🌎 Planets
A student lists the planets as Mercury → Venus → Mars → Earth. What correction should be made?
Earth and Mars should switch places
Earth continues moving through space but does not travel away from the Sun. What force keeps it in orbit?
Gravity
A student says, “The Solar System and the Milky Way are the same thing.” What is wrong with this statement
The Solar System is part of the Milky Way galaxy.
An object has a nucleus and coma and is sometimes called a “dirty snowball.” Identify it.
Comet
A diagram shows Earth at the center with the Sun and planets moving around it. Which model is represented?
Geocentric model
Earth and Venus are similar in size and composition. What major condition identified in the assessment makes Venus unable to support life as we know it?
It's extremely high surface temperature.
Two objects are moved farther apart without changing their masses. Predict what happens to their gravitational attraction.
It decreases
Complete the hierarchy: Earth → ______ → Milky Way → Universe.
Solar System
Scientists discover a rocky object orbiting the Sun between Mars and Jupiter. What is it most likely to be?
Asteroid
A second diagram places the Sun at the center with planets orbiting it. Which model is represented?
Heliocentric model
Jupiter takes about 11.9 Earth years to orbit the Sun, while Neptune takes about 165 years. What best explains this difference?
Neptune is much farther from the Sun and has a much larger orbit.
Two planets are the same distance from the Sun, but Planet A has more mass than Planet B. Which would have the greater gravitational attraction with the Sun?
Planet A
Scientists classify galaxies by characteristics such as shape. How is the Milky Way classified in the assessment?
Barred spiral galaxy
A rocky object is traveling through space toward Earth. What is it called before it enters Earth's atmosphere?
Meteoroid
Ptolemy's model and Copernicus's model disagree about what major feature of the Solar System?
What is at the center—Earth or the Sun.
A planet is farther from the Sun than Uranus. Based on the organization of our Solar System, identify the planet and predict whether its revolution is longer or shorter than Uranus's.
Neptune; longer.
A student claims that gravity alone explains planetary motion. What additional idea from the assessment should be included?
Inertia
A student travels hypothetically from Earth beyond the Solar System but remains inside the Milky Way. Has the student left our galaxy? Explain.
No. The Solar System is only one part of the Milky Way
The same object enters Earth's atmosphere and produces a bright streak of light. Its classification changes to what?
Meteor
Scientists observe that distant galaxies are moving away from one another. What idea does this evidence support?
The universe is expanding.
A student says, “The farther a planet is from the Sun, the colder it must always be.” Using what you know about planetary properties, explain why distance alone should not be used to describe every characteristic of a planet.
Planets have different properties; distance is important, but it is not the only characteristic that affects a planet.
Planet A is very massive but far from another object. Planet B is less massive but much closer. Why can't you determine which gravitational attraction is stronger using mass alone
Gravitational attraction depends on both mass and distance.
Hubble observed evidence that the universe is expanding. Explain why an expanding universe supports the idea that the universe was once much more concentrated.
If objects are moving farther apart now, they would have been closer together in the past.
A meteoroid enters Earth's atmosphere, creates a bright streak, and part of it survives to reach the ground. Give its three names in chronological order.
Meteoroid → Meteor → Meteorite
According to the Big Bang Theory, which happened first: the cosmic dark ages, formation of the first stars, or formation of galaxies? Put all three in the correct order.
Cosmic Dark Ages → First Stars → Galaxies