The Terror and Wonder of Space

Marrow

• The soft tissue inside bones.

• A type of blood cell

• A part of the brain

• A muscle in the arm

Convivial

• Friendly and enjoyable; fun to be around.

• Serious and reserved; not sociable.

• Boring and dull; lacking excitement.

• Aggressive and hostile; unfriendly.

Habitat

• The natural home or environment where an animal or plant lives.

• A type of food that animals eat.

• A place where animals go to sleep at night.

• A method of communication among animals.

Idle

• Not doing anything; not active.

• Busy with tasks and responsibilities.

• Engaged in physical activity.

• In a state of constant motion.

Crucial

• Very important; something you must pay attention to.

• Not important at all; something you can ignore.

• Somewhat important; worth considering but not essential.

• A minor detail; not worth your time.

Vacuum

• A space with no air; or a machine that sucks up dirt.

• A type of weather phenomenon involving high pressure.

• A device used for measuring air pressure.

• A method of cleaning using water and soap.

Molten

• Melted by heat (like melted metal or rock).

• Solidified by cold temperatures.

• A type of liquid that cannot be heated.

• A process of freezing substances.

Muse

• To think carefully or deeply about something.

• To create a work of art or literature.

• To entertain or amuse someone.

• To travel or explore new places.

Entail

• To exclude or leave out something as a part of something else.

• To include or require something as a part of something else.

• To change or modify something completely.

• To simplify or make something easier.

Forlorn

• Very sad or lonely.

• Extremely happy and cheerful.

• Full of life and energy.

• Calm and peaceful.