Earth: The third planet from the Sun; it rotates on its axis, creating a day (24 hours).
Year: The time taken for Earth to orbit the Sun, approximately 365 days.
Solar System: Contains Earth and other planets orbiting our Sun, a star.
Other Planets: Not the only ones; searching for additional planets is ongoing.
Milky Way Galaxy: A vast collection of billions of stars, including our Sun. Visualized as a spiral shape.
Local Group: Our local galaxy cluster, which includes the Andromeda Galaxy moving toward us.
Vastness of Universe: Contains numerous galaxies, many with their own stars and planets.
Hubble Deep Field: An image capturing thousands of galaxies in a small part of the dark sky—approximately 5,500 galaxies visible.
Definition of a Star: A large collection of hydrogen gas undergoing nuclear fusion.
Nuclear Fusion: Process where hydrogen is converted into helium, releasing energy (light and heat).
E=mc²: Einstein's equation explaining that mass is converted into energy during fusion (mass defect).
Energy Forms: Stars emit light and heat as energy; this explains why they shine and are hot.
Hydrostatic Equilibrium: Balance between gravity (pulling inward) and radiation pressure (pushing outward) in a star.
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