Potential Threats – Astronomy Final Exam
The key terms of Astronomy Final Exam include, Potential Threats.
Which of the following is of particular interest to scientists in their observations because of potential threats to the Earth?
NEOs
The comet cools down and begins to glow brightly as a result of this decreased temperature.
False
In 2011, astronomers were concerned that NEO 2011 AG5 might impact Earth in which year?
2040
Which of the following is NOT a characteristic of meteor showers?
Rocky Debris
Which of the following defines the Permian-Triassic?
A catastrophic event where 90 percent of the ocean’s species were lost and 70 percent of the land life was thought to go extinct.
The Sun’s radius is about 100 times the radius of the Milky Way.
False
The ________________ of the Sun is the interior or center part of this star.
Core
A person on Earth would weigh a lot more on the Sun due to increased ________________.
Gravity
The Sun orbits the center of the Milky Way.
True
A deuterium nucleus contains which of the following?
One proton and one neutron
Which of the following is MOST useful to scientists in measuring the size of asteroids?
The gravitational effect when spacecraft flies close to the asteroid.
Which of the following BEST describes a meteoroid?
Pieces of rock and other material that are present in the Solar System.
Comets are called “dirty snowballs” because of their frozen, icy state.
True
Debris from meteorites is found most commonly where?
Antarctica
Comets’ lives are increased the more often that they pass by the Sun.
False
Which of the following explains why Halley’s Comet is unique
it orbits the sun in regular intervals
Which of the following terms refers to the gas that escapes a comet?
plasma tail
The comets in the Oort Cloud may take up to __________________ Earth years to orbit the Sun just once.
30 million Years
Where is the Kuiper Belt located?
Beyond Neptune
When do comets show tails?
When they are approaching the Sun
Which of the following is of particular interest to scientists in their observations because of potential threats to the Earth?
NEOs
The comet cools down and begins to glow brightly as a result of this decreased temperature.
False
In 2011, astronomers were concerned that NEO 2011 AG5 might impact Earth in which year?
2040
Which of the following is NOT a characteristic of meteor showers?
Rocky Debris
Which of the following defines the Permian-Triassic?
A catastrophic event where 90 percent of the ocean’s species were lost and 70 percent of the land life was thought to go extinct.