1.3 - 2.2

We cannot see a new moon in our sky because __________.

A new moon is quite near the Sun in the sky.

Known prior to New Horizons mission, Learned from New Horizons mission, or possible but not proven by New Horizons mission? Pluto is less massive than any of the terrestrial planets Pluto has a comet-like composition of ice and rock Pluto is a member of the Kuiper belt Pluto is sometimes nearer to the Sun than Neptune

Known prior to New Horizons mission

Known prior to New Horizons mission, Learned from New Horizons mission, or possible but not proven by New Horizons mission? Pluto's thin atmosphere contains haze particles that can fall to the surface Pluto has smooth plains of nitrogen ice Pluto has tall mountains built of water ice Charon has huge, deep canyons

Learned from New Horizons mission

Which of the following is not true during Northern Hemisphere summer?

Noontime shadows are longer in the Northern Hemisphere than in the Southern Hemisphere.

Scientist knew the ___________ of Pluto from Pluto's calculated density.

approximate composition

Scientist knew the __________ of Pluto because the 1978 discovery of its moon Charon allowed them to calculate it with Newton's version of Kepler 19s third law.

approximate mass

Lunar eclipses can occur only when the phase of the Moon is __________.

full

We can be sure that variations in Earth's distance from the Sun are not the cause of the seasons, because

if distance were responsible for the seasons, both the Northern and Southern Hemispheres would have summer at the same time.

The event that triggered the change in Pluto's status from planet to dwarf planet was the discovery that

it shares its orbital region with similarly sized objects.

What does Pluto have in common with the eight official planes of our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune)?

its round shape

Two stars that are in the same constellation: must both be part of the same cluster of stars in space. must both have been discovered at about the same time. may actually be very far away from each other.

may actually be very far away from each other.

Known prior to New Horizons mission, Learned from New Horizons mission, or possible but not proven by New Horizons mission? Pluto has active volcanoes Pluto has a subsurface ocean of liquid water

possible but not proven by New Horizons mission

Scientists knew that Pluto is ___________ because decades of observation at allowed them to precisely plot its orbit.

sometimes nearer to the Sun than Neptune

The reason we do not have a solar eclipse at every new moon is that

the Moon's orbit is inclined relative to Earth's orbit around the Sun.

One week after full moon, the Moon's phase is

third quarter

true or false: A moon that's illuminated on the left side is waxing, while a moon that's illuminated on the right side is waning.

true