Flashcards on Astronomy

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What is a supernova?

A supernova is a powerful and luminous explosion that occurs when a star has exhausted its fuel and its core collapses, rebounding in a massive shockwave that blows off the outer layers of the star.

What is a black hole?

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.

What is an asteroid?

An asteroid is a small, rocky object that orbits the Sun. They can range in size from a few meters to hundreds of kilometers in diameter.

What is the name of the largest moon in our solar system?

Ganymede

What is a galaxy?

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

What is the difference between a comet and an asteroid?

Comets are icy, small Solar System bodies that, when passing close to the Sun, heat up and release gases, forming a visible atmosphere or coma, and often a tail. Asteroids are mainly composed of rock and metal and are much larger and more massive than comets.

What is the name of the closest star to Earth?

The closest star to Earth after the Sun is Proxima Centauri.

What is a constellation?

A constellation is a group of stars that are perceived as forming a figure or pattern within a specific region of the celestial sphere.

What is the Kuiper Belt?

The Kuiper Belt is a region of the Solar System beyond the planets, extending from the orbit of Neptune to approximately 50 Astronomical Units (AU) from the Sun. It contains many small icy bodies, including dwarf planets like Pluto.

What is a red giant?

A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.

What is the Oort Cloud?

The Oort Cloud is a hypothetical, massive, and extremely distant cloud of comets that is believed to be the source of most of the long-period comets that enter the inner solar system.

What is a pulsar?

A pulsar is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles.

What is the name of the largest planet in our solar system?

Jupiter

What is a nebula?

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

What is a white dwarf?

A white dwarf is a small, dense star typically composed of carbon and oxygen that has exhausted its nuclear fuel and has collapsed to a size similar to that of Earth.

What is a supernova?

A supernova is a powerful and luminous explosion that occurs when a star has exhausted its fuel and its core collapses, rebounding in a massive shockwave that blows off the outer layers of the star.

What is a black hole?

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.

What is an asteroid?

An asteroid is a small, rocky object that orbits the Sun. They can range in size from a few meters to hundreds of kilometers in diameter.

What is the name of the largest moon in our solar system?

Ganymede

What is a galaxy?

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

What is the difference between a comet and an asteroid?

Comets are icy, small Solar System bodies that, when passing close to the Sun, heat up and release gases, forming a visible atmosphere or coma, and often a tail. Asteroids are mainly composed of rock and metal and are much larger and more massive than comets.

What is the name of the closest star to Earth?

The closest star to Earth after the Sun is Proxima Centauri.

What is a constellation?

A constellation is a group of stars that are perceived as forming a figure or pattern within a specific region of the celestial sphere.

What is the Kuiper Belt?

The Kuiper Belt is a region of the Solar System beyond the planets, extending from the orbit of Neptune to approximately 50 Astronomical Units (AU) from the Sun. It contains many small icy bodies, including dwarf planets like Pluto.

What is a red giant?

A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.

What is the Oort Cloud?

The Oort Cloud is a hypothetical, massive, and extremely distant cloud of comets that is believed to be the source of most of the long-period comets that enter the inner solar system.

What is a pulsar?

A pulsar is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles.

What is the name of the largest planet in our solar system?

Jupiter

What is a nebula?

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

What is a white dwarf?

A white dwarf is a small, dense star typically composed of carbon and oxygen that has exhausted its nuclear fuel and has collapsed to a size similar to that of Earth.

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