Nebulae are enormous clouds in outer space. They are made mostly of hydrogen gas, helium gas, and dust. Some nebulae glow brightly, while others do not. The stars that people see are huge, bright balls of glowing gas. They are made mostly of hydrogen and helium.

Which statement correctly describes other ways in which nebulae and stars are different?
A.
Stars can never form inside a nebula but a nebula can be produced by any star.
B.
Stars can form inside a nebula but a nebula can never be produced by any star.
C.
A star always has a higher density than a nebula.
D.
A nebula always has a higher density than a star.
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For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5