Waves and Universe

2. Dwarf: The hot, dense remains of a low-to-medium mass star after it has shed its outer layers.
5. Class: The categorization of stars based on their spectral characteristics and temperature.
8. The two times each year when the Sun reaches its highest or lowest point in the sky at noon.
11. Cycle: The roughly 29.5-day period during which the Moon passes through all its phases.
14. Tide: A tide with the largest daily tidal range, occurring during the new and full moon phases.
15. The two times each year when day and night are of approximately equal length everywhere on Earth.
17. The total amount of energy a star emits into space per second.
19. An exceptionally large, bright star that has expanded after exhausting its core hydrogen.
22. Fusion: The process where light atomic nuclei combine to form heavier ones, releasing vast amounts of energy.
23. Galaxy: A galaxy shaped like a rounded or flattened sphere, containing mostly older stars and little gas.
25. Tides: The regular rise and fall of sea levels caused by the gravitational pull of the Moon and Sun.
26. Diagram: A scatter plot showing the relationship between a star's temperature and its brightness.

1. The orbital motion of one object around another, such as Earth around the Sun.
3. A massive stellar explosion that occurs at the end of a high-mass star's life.
4. The universal force of attraction between all matter.
6. Tide: A tide with the smallest daily tidal range, occurring during the first and third quarter moon phases.
7. Way Galaxy: The barred spiral galaxy that contains our Sun and solar system.
9. Sequence: The major grouping of stars on the H-R diagram that are actively fusing hydrogen in their cores.
10. Bang Theory: The scientific model describing the early expansion and origin of the universe.
12. Shift: The displacement of light toward longer wavelengths as an object moves away from the observer.
13. Tide: The point in the tidal cycle where the water reaches its minimum height on the shore.
14. The four divisions of the year resulting from Earth's axial tilt and its orbit around the Sun.
16. Tide: The point in the tidal cycle where the water reaches its maximum height on the shore.
18. A large cloud of interstellar gas and dust where stars are often born.
20. A massive system of stars, stellar remnants, gas, dust, and dark matter bound together by gravity.
21. Galaxy: A galaxy with a central bulge and distinct arms that curve outward in a pinwheel shape.
24. Galaxy: A galaxy with no specific symmetrical shape or structure.