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151) What type of chemical compound is held together by ionic bonds?

A salt is an ionic compound that results from the neutralization reaction of an acid and a base.

152) What is it called when one celestial body obscures another?

An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer.

153) What do you call an interstellar cloud of dust?

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Contrary to fictional depictions where starships hide in nebulae as thick as cloud banks, in reality a nebula that is barely visible to the human eye from Earth would appear larger, but no brighter, from close by.

154) A mushroom is an example of _______.

A mushroom (or toadstool) is the fleshy, spore-bearing fruiting body of a fungus.

155) Which of the following is biggest?

The Universe is all of time and space and its contents.

156) How many chambers does the human heart have?

The human heart has four chambers, which are the left and right atria and the left and right ventricles.

157) What temperature is absolute zero?

Absolute zero is the lowest temperature that is theoretically possible, at which the motion of particles that constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to -273.15°C or -459.67°F.

158) What is the longest bone in the human body?

The femur connects to the knee at one end and fits into the hip socket at the other. It's the longest bone in many other mammals as well.

159) What term describes the amount of light a planetary body reflects?

A perfect reflector such as a mirror would have an albedo of 100, the moon has an albedo of 7, and the Earth has an albedo of 36.

160) What term describes the center of gravity of the Earth and moon?

The barycenter is the center of mass of two or more bodies that are orbiting each other, or the point around which they both orbit. It is an important concept in fields such as astronomy and astrophysics.