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Galactic Geography
$200The massive spiral galaxy closest to our own Milky Way.
$400The region at the center of the galaxy where a supermassive black hole resides.
$600This type of galaxy shape is characterized by a central bulge and sweeping arms.
$800Our solar system is located in this smaller spiral arm of the Milky Way.
$1000This satellite galaxy is visible to the naked eye in the Southern Hemisphere.
Cosmic Anomalies
$200An intense explosion marking the final stage of a massive star's life.
$400A theoretical bridge connecting two distant points in space-time.
$600The invisible substance that makes up most of the mass in galaxies.
$800A region where gravity is so strong that even light cannot escape.
$1000The mysterious force causing the accelerating expansion of the universe.
Stellar Evolution
$200A cloud of gas and dust where new stars are born.
$400Our sun is currently in this long, stable phase of its life cycle.
$600The remnant core left behind by a low-mass star like our Sun.
$800A cool, massive star that has exhausted its hydrogen fuel.
$1000The state of matter found in a very dense stellar remnant composed of neutrons.
Planetary Science
$200The rocky planet closest to the Sun.
$400The planet known for its spectacular ring system.
$600The largest planet in our solar system, known for the Great Red Spot.
$800This planet rotates on its side compared to its orbital plane.
$1000A dwarf planet located in the Kuiper Belt.
Famous Astronomers
$200He used a telescope to discover the moons of Jupiter.
$400He formulated the laws of planetary motion.
$600He proposed that the Sun, not the Earth, was the center of the universe.
$800He discovered that the universe is expanding by observing distant galaxies.
$1000She discovered the period-luminosity relationship for Cepheid variables.
Space Missions
$200The first human-made object to orbit the Earth.
$400The historic mission that first landed humans on the Moon.
$600A space telescope launched in 1990 that revolutionized our view of the universe.
$800This rover landed on Mars in 2012 to look for past habitability.
$1000A space probe that provided the first close-up images of Pluto.