Lesson 178 of 1524
Between the Stars: Gas and Dust in Space
About 1% of the interstellar matter is in the form of solid interstellar dust grains
Practice this chapterAbout 1% of the interstellar matter is in the form of solid interstellar dust grains Glowing clouds (nebulae) of ionized hydrogen are called H II regions and have temperatures of about 10,000 K.
About 15% of the visible matter in the Galaxy is in the form of gas and dust, serving as the raw material for new stars. About 99% of this interstellar matter is in the form of gas—individual atoms or molecules.
interstellar dust — tiny solid grains in interstellar space thought to consist of a core of rocklike material (silicates) or graphite surrounded by a mantle of ices; water, methane, and ammonia are…. nebula — a cloud of interstellar gas or dust; the term is most often used for clouds that are seen to glow with visible light or infrared. visible matter in the Galaxy — in the form of gas and dust, serving as the raw material for new stars. electron — captured by an ion and cascades down to lower-energy levels.
Worked example
What does “interstellar dust” mean in Between the Stars: Gas and Dust in Space?
- 1Use the wording this chapter gives for interstellar dust.
- 2The book says: tiny solid grains in interstellar space thought to consist of a core of rocklike material (silicates) or graphite surrounded by a mantle of ices; water, methane, and ammonia are….
- 3Do not use the meaning of nebula. That term means a cloud of interstellar gas or dust; the term is most often used for clouds that are seen to glow with visible light or infrared.
Result: tiny solid grains in interstellar space thought to consist of a core of rocklike material (silicates) or graphite surrounded by a mantle of ices; water, methane, and ammonia are…
Why. That is the meaning this chapter gives for interstellar dust.
Do not swap interstellar dust and nebula. interstellar dust means tiny solid grains in interstellar space thought to consist of a core of rocklike material (silicates) or graphite surrounded by a mantle of ices; water, methane, and ammonia are…. nebula means a cloud of interstellar gas or dust; the term is most often used for clouds that are seen to glow with visible light or infrared.
Practice margin
This chapter
A fresh set from this chapter only. Choose 10 or 20. Multiple choice and fill-in, with no repeat inside the set.