Astronomy Ultimate Astronomy 3 — Questions and Answers
Question 1: Which layer of the Sun is the visible surface that we see in ordinary light?
- Corona
- Chromosphere
- Photosphere (Correct answer)
- Radiative zone
Correct answer: Photosphere
The photosphere is the Sun's visible surface where most sunlight is emitted.
Question 2: What is the primary composition of a comet's nucleus?
- Molten rock
- Ice and dust (Correct answer)
- Pure iron
- Hydrogen gas
Correct answer: Ice and dust
Comet nuclei are 'dirty snowballs' made of ice, frozen gases, and dust.
Question 3: Which unit is defined as the average distance between the Earth and the Sun?
- Parsec
- Light-year
- Astronomical unit (Correct answer)
- Kiloparsec
Correct answer: Astronomical unit
One astronomical unit (AU) equals about 149.6 million kilometers, the Earth-Sun distance.
Question 4: What phenomenon occurs when the Moon passes directly between the Sun and Earth?
- Lunar eclipse
- Solar eclipse (Correct answer)
- Transit of Venus
- Occultation of Mars
Correct answer: Solar eclipse
A solar eclipse happens when the Moon blocks the Sun as seen from Earth.
Question 5: Which planet is known for its prominent and extensive ring system?
- Neptune
- Uranus
- Saturn (Correct answer)
- Jupiter
Correct answer: Saturn
Saturn has the most visible and extensive ring system, made of ice and rock particles.
Question 6: What is the approximate age of the universe according to current estimates?
- 4.6 billion years
- 13.8 billion years (Correct answer)
- 100 billion years
- 1 trillion years
Correct answer: 13.8 billion years
The universe is estimated to be about 13.8 billion years old based on cosmic microwave background data.
Question 7: What do astronomers call a star that suddenly increases dramatically in brightness due to a stellar explosion?
- Pulsar
- Supernova (Correct answer)
- Quasar
- White dwarf
Correct answer: Supernova
A supernova is the explosive death of a star, briefly outshining an entire galaxy.
Astronomy Ultimate Astronomy 3
Which layer of the Sun is the visible surface that we see in ordinary light?