How do mass-to-light ratios for the inner regions of galaxies compare to the mass-to-light ratios we find when we look farther from a galaxy's center? What does this tell us about dark matter in galaxies?
What will be an ideal response?
The farther we look from a galaxy's center, the higher mass-to-light ratios we find. In fact, this ratio grows as we go from single galaxies to clusters of galaxies. This tells us that mass is concentrated not at the centers of galaxies but in the halos of galaxies and the intergalactic medium.
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Which type of NEO explodes in the atmosphere before reaching the Earth's surface?
Which type of NEO explodes in the atmosphere before reaching the Earth's surface?
- Asteroid
- Meteroite
- Bolide
Consider a mass initially moving at 7.50 m/s. (a) How long does it take to move 3.5 km if it accelerates at 0.550 m/s2? (b) How fast is it moving after this acceleration?
What will be an ideal response?
Which process would release energy from gold, fission or fusion? From carbon?
A) gold: fission; carbon: fusion B) gold: fusion; carbon: fission C) gold: fission; carbon: fission D) gold: fusion; carbon: fusion
A(n) _________ is a collection of 10^5 to 10^6 stars in a region 10 to 30 pc in diameter. The stars in the collection tend to be more than 10^9 years old and mostly yellow and red stars
a. Herbig-Haro object b. globular cluster c. open cluster d. giant cluster e. supernova