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At how many kilometers above Earth does outer space begin?
100 kilometers above Earth.
What types of particles and radiation are found in space?
Particles of dust, gas, electromagnetic radiation, magnetic fields, and cosmic rays.
What are stars?
Luminous balls of gas.
What is the closest star to Earth?
The Sun
What objects make up our Solar System?
Planets, rocks, dust, moons, and other cosmic materials orbiting the Sun.
What is a galaxy made of?
A galaxy is made of gas, dust, and stars held together by gravity.
What is the name of Earth’s galaxy?
The Milky Way.
What percentage of the Milky Way is dark matter?
90%
What does the remaining 10% of the Milky Way consist of?
Stars, planets, and other visible materials.
How many planets do scientists believe are in the Milky Way?
At least 100 billion planets.
Name a star in the Milky Way that is larger than the Sun.
Rigel or VY Canis Majoris.
What shape does the Milky Way galaxy have?
A spiral shape.
What is the name of the supermassive black hole at the center of the Milky Way?
Sagittarius A*.
What is a common feature of most galactic centers?
Black holes.
How is the Sun categorized in terms of size?
It is a medium-sized star.
What is the temperature at the core of the Sun?
Up to 15,000,000°C (over 27,000,000°F).
