The Universe and Stars

What is the approximate size of the Milky Way Galaxy?

• 10 km

• 100 km-60 AU

• 3 x 10¹9 km

• 1021 km

What is a galaxy?

• A large, glowing ball of gas that generates heat and light through nuclear fusion

• A great island of stars in space, all held together by gravity and orbiting a common center

• A likely 'twin' of the Milky Way

• A ball of gas and dust where stars are born

What is a star?

• A large, glowing ball of gas that generates heat and light through nuclear fusion

• A great island of stars in space, all held together by gravity and orbiting a common center

• A likely 'twin' of the Milky Way

• A ball of gas and dust where stars are born

What is the Sun?

• A large, glowing ball of gas that generates heat and light through nuclear fusion

• A great island of stars in space, all held together by gravity and orbiting a common center

• A likely 'twin' of the Milky Way

• A ball of gas and dust where stars are born

What do massive stars do when they die?

• They scatter the elements they've produced into space

• They create the elements through fusion

• They form planets in surrounding disks

• They explode and create new stars

How are stars born?

• Inside clouds of gas and dust

• Through nuclear fusion

• By exploding and scattering elements into space

• By orbiting a common center

What do stars create?

• Elements heavier than hydrogen and helium

• Elements lighter than hydrogen and helium

• Elements through nuclear fusion

• Elements through quantum fluctuations

What is the approximate age of the Universe?

• 400,000 years

• 14 billion years

• 3 million light years

• 100 million light years

What is the Cosmic Microwave Background?

• Low-energy light from all directions, remnants of the Big Bang

• A great island of stars in space, all held together by gravity and orbiting a common center

• A likely 'twin' of the Milky Way

• A ball of gas and dust where stars are born