A _____ is a collapsing cloud of gas and dust destined to become a star
A) protostar
B) protocloud
C) stellar cluster
D) stellar association
A
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In the NSOM technique, the letter S stands for:
a. slow. c. scanning. b. small. d. swift.
The constellations of the zodiac fall along
A) the ecliptic. B) the celestial equator. C) lines of longitude. D) lines of latitude.
What prevents Titan from being a candidate for supporting an evolution of life? a. It is too far from the Sun
b. Its atmosphere doesn't contain the right mixture of elements. c. Its surface is covered in methane lakes. d. Its surface temperature is too cold. e. It is tidally locked to Saturn rather than the Sun.
A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity
What is the direction of the electric field? A) along the -y-axis B) along the +y-axis C) along the -x-axis D) along the +x-axis E) along the -z-axis