Test 3 Space Vocabulary

3. The amount of matter in an object, often measured in kilograms.
5. The entirety of space, time, matter, and energy in existence.
9. The process in which two atomic nuclei combine to form a heavier nucleus, releasing a tremendous amount of energy. Star: A luminous celestial object made up of hot, glowing gases, primarily hydrogen and helium.
10. A rotating disk of gas and dust around a young star, where planets may form.
11. A region of space with incredibly strong gravitational pull, from which nothing can escape.
12. A powerful explosion that occurs at the end of a massive star's life cycle.
14. A vast system of stars, gas, dust, and dark matter held together by gravity.
15. A tide with the least difference between high and low water levels, occurring during the first and third quarters of the moon.
17. A cloud of gas and dust in space, where stars are born.
18. Diagram (H-R diagram): A graphical tool used in astronomy to classify stars based on their luminosity and temperature.
21. The periodic rise and fall of sea levels caused by the gravitational pull of the Moon and the Sun.
23. The spiral galaxy that includes our solar system.
24. The change in the frequency or wavelength of waves as an object moves relative to an observer, often used to study celestial objects' motion.
25. An unmanned spacecraft sent to explore outer space or other celestial bodies.

1. The force exerted on an object due to gravity.
2. An optical instrument that magnifies distant objects to observe them more clearly.
4. An instrument used to analyze the spectrum of light emitted or absorbed by an object.
6. The remnant of a low to medium-mass star after it has exhausted its nuclear fuel and collapsed, no longer undergoing fusion.
7. The prevailing cosmological model that describes the rapid expansion of the universe from a hot, dense state at its origin.
8. The force that attracts two objects with mass towards each other.
13. A tide with the greatest difference between high and low water levels, occurring during a full moon and new moon.
16. The curved path an object follows as it revolves around another object in space.
19. An artificial object placed in orbit around a planet or celestial body.
20. The pattern of specific wavelengths of light emitted by an element or substance.
22. The distance that light travels in one year, approximately 5.88 trillion miles (9.46 trillion kilometers).