In order to turn a star's proper motion into its space velocity, we must also know
A) its mass and spectral type.
B) its temperature and age.
C) its distance and radial velocity.
D) its distance and mass.
E) its spectral type and period of rotation.
C
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A candle emits what kind of spectrum?
A. blueshifted B. emission-line C. absorption-line D. continuous E. redshifted
The Earth-Moon system may have been the result of a collision between the Earth and a(n) ________-size object
Fill in the blank(s) with correct word
An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s b. 25 m/s c. 30 m/s d. 21 m/s e. 17 m/s
How is Neptune's moon Triton important to our understanding of the Kuiper belt origin?
A. Triton has a backward orbit, which indicates that it was captured by Neptune from the Kuiper belt. The study of Triton helps to understand other Kuiper belt objects. B. Triton's orbit is very close to the Kuiper belt and it can capture comets that then hits its surface. C. The study of the Triton's surface helps to understand composition of Kuiper belt objects. D. Triton has a backward orbit, which indicates that there is a strong influence on it from the Kuiper belt. The study of Triton helps to calculate the characteristics of Kuiper belt objects. E. Triton's orbit is very close to the Kuiper belt and it can affect the orbits of comets and send them towards the Sun, which helps us to study the comets that travel close to Earth.