Some regions of the Milky Way's disk appear dark because
a) there are no stars there.
b) stars in that direction are obscured by interstellar gas.
c) stars in that direction are obscured by interstellar dust.
d) numerous black holes capture all the starlight behind them
Answer: c) stars in that direction are obscured by interstellar dust.
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Astronomy 101
- In the formation of our Galaxy
- The high-speed motion of gas and stars near the Milky Way Galaxy's centre is explained by
- The period-luminosity relationship is a crucial component of
- A nova involves
- In a young star cluster, when more massive stars are evolving into red giants, the least massive stars are
- Very young stars in small clusters of 10-100 members are known as
- The event that marks the end of a star's evolutionary life before becoming a white dwarf is
- The helium flash occurs
- What is the single most important characteristic in determining the course of a star's evolution?
- 21-centimeter radiation is important because?
- Stellar parallax is used to measure the
- Wien's law tells us that the hotter an object, the _____ the peak wavelength of its emitted light.
- When we observe stars near the centre of the Milky Way Galaxy, we detect light that was emitted from those stars about
- What two observations allow us to estimate the Galaxy's mass?
- Compared to stars like the Sun in the disk of the Milky Way, stars that populate the extended spheroidal halo of the galaxy were born
- The primary reason that massive O-type stars are not found in the galactic halo is that they are
- Kepler's Third Law does NOT apply to the motion of
- Which of these is not a typical part of our Galaxy's spiral arms?
- Our Sun is located in the Milky Way Galaxy
- The location of the galactic centre was identified using
- A nova involves
- A white dwarf can explode when
- A key feature of globular clusters is that they have
- If two stars are on the main sequence, and one is more luminous that the other, we can be sure that the
- Astronomers determine the age of star clusters by observing