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The density wave theory explains spurs and branches along the spiral arms.
Cytoplasm
The jelly-like substance within a cell, excluding the nucleus, that contains organelles and is the site of most cellular processes.
Food And Drug Administration
A federal agency of the United States responsible for regulating and supervising the safety of foods, dietary supplements, drugs, cosmetics, and medical devices.
Positively Charged Particle
An atom or molecule with more protons than electrons, giving it a net positive charge.
Midline
An imaginary line that divides the body into equal left and right halves.
Q11: Seyfert galaxies are spiral galaxies with active
Q12: Any element heavier than helium is collectively
Q22: When material expanding away from a star
Q47: The Himalayan Mountains are rugged, jagged peaks
Q48: That the Moon has no magnetic field
Q72: The rotation curve of a galaxy can
Q78: The mass of a single galaxy might
Q85: "Seeds" around which galaxies, clusters and walls
Q90: Due to the dust in the interstellar
Q93: YSOs are in hydrostatic equilibrium.