What are the dark blobs (indicated by the red arrows) in this photograph from the Hubble Space Telescope?
A) cold, dense molecular clouds in which stars are forming
B) warm atomic hydrogen gas, much like most of the gas in the galaxy
C) tall interstellar bubbles blown out by supernovae or stellar winds
D) jets of hot gas shot out from young binary star systems
A) cold, dense molecular clouds in which stars are forming
You might also like to view...
The Roche limit is the:
A) distance from the Sun within which a planet cannot retain or create an atmosphere. B) minimum distance between a planet and a satellite that can hold itself together by its own gravity. C) minimum mass required by an object in the Solar System to be classified as a planet instead of a star. D) distance from Earth at which radio communication with a satellite is lost.
The intensity of cosmic rays bombarding the Earth's surface is greatest at
A) the poles. B) mid-latitudes. C) the equator. D) no particular locations.
Life will most likely be able to appear and evolve on a planet around which stage of a star's life?
A) core hydrogen-fusion B) shell helium-fusion C) core helium-fusion D) shell hydrogen-fusion
A mass of 0.40 kg, hanging from a spring with a spring constant of 82 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through a point at 0.05 m displacement? The starting displacement of the mass is 0.10 m from its equilibrium position
a. zero b. 0.36 m/s c. 0.11 m/s d. 1.6 m/s e. 0.72 m/s