An accretion disk is a structure formed by diffuse material in orbital motion around a massive central body. Friction and other forces cause the material to spiral inward, releasing immense potential energy as heat and light, often becoming the brightest objects in the universe.
efficiency. The Milky Way is a barred spiral galaxy containing 100–400 billion stars. At its center lies Sagittarius A*, a supermassive black hole around which the entire galaxy rotates.
Earth is the third planet from the Sun and the only astronomical object known to harbor life. With over 70%
of its surface covered by ocean, it supports a diverse biosphere and complex climate systems protected by a
magnetic field and atmosphere.
Diameter: 12,742 km
Day Length: 24 hours
Population: 8.2 billion
The Moon
Earth's Satellite
The Moon is Earth's only natural satellite. It is the fifth-largest satellite in the Solar System and the
largest among planetary satellites relative to the size of the planet that it orbits. Its gravitational
influence is the main driver of Earth's tides and very slowly lengthens Earth's day.
Diameter: 3,474 km
Distance: 384,400 km
Orbital Period: 27.3 days
Moon Surface
The Moon is a stark, airless world of ancient rock, its surface shaped by billions of years of
relentless impacts and volcanic activity. This natural satellite of Earth displays a dramatic
contrast between dark basaltic plains and bright, heavily cratered highlands, recording a visible
history of the early solar system. Locked in synchronous rotation, it exerts a profound
gravitational influence on Earth, governing ocean tides and subtly stabilizing the planet’s axial
tilt.
Lunar Rover
The lunar rover rests on a desolate expanse of gray regolith, its rugged metal frame and dust-coated
wheels standing as a testament to human engineering beyond Earth. In the pitch-black sky above, the
distant Earth glows in blue and white, a fragile oasis suspended in space, emphasizing the vast
scale of the cosmos and the quiet persistence of exploration on the Moon’s barren surface.
Earth
The Blue Marble
Earth is the third planet from the Sun and the only astronomical object known to harbor life. With over 70%
of its surface covered by ocean, it supports a diverse biosphere and complex climate systems protected by a
magnetic field and atmosphere.
Diameter: 12,742 km
Day Length: 24 hours
Population: 8.2 billion
The Moon
Earth's Satellite
The Moon is Earth's only natural satellite. It is the fifth-largest satellite in the Solar System and the
largest among planetary satellites relative to the size of the planet that it orbits. Its gravitational
influence is the main driver of Earth's tides and very slowly lengthens Earth's day.
Diameter: 3,474 km
Distance: 384,400 km
Orbital Period: 27.3 days
Moon Surface
The Moon is a stark, airless world of ancient rock, its surface shaped by billions of years of
relentless impacts and volcanic activity. This natural satellite of Earth displays a dramatic
contrast between dark basaltic plains and bright, heavily cratered highlands, recording a visible
history of the early solar system. Locked in synchronous rotation, it exerts a profound
gravitational influence on Earth, governing ocean tides and subtly stabilizing the planet’s axial
tilt.
Lunar Rover
The lunar rover rests on a desolate expanse of gray regolith, its rugged metal frame and dust-coated
wheels standing as a testament to human engineering beyond Earth. In the pitch-black sky above, the
distant Earth glows in blue and white, a fragile oasis suspended in space, emphasizing the vast
scale of the cosmos and the quiet persistence of exploration on the Moon’s barren surface.
Earth
The Blue Marble
Earth is the third planet from the Sun and the only astronomical object known to harbor life. With over 70%
of its surface covered by ocean, it supports a diverse biosphere and complex climate systems protected by a
magnetic field and atmosphere.
Diameter: 12,742 km
Day Length: 24 hours
Population: 8.2 billion
The Moon
Earth's Satellite
The Moon is Earth's only natural satellite. It is the fifth-largest satellite in the Solar System and the
largest among planetary satellites relative to the size of the planet that it orbits. Its gravitational
influence is the main driver of Earth's tides and very slowly lengthens Earth's day.
Diameter: 3,474 km
Distance: 384,400 km
Orbital Period: 27.3 days
Moon Surface
The Moon is a stark, airless world of ancient rock, its surface shaped by billions of years of
relentless impacts and volcanic activity. This natural satellite of Earth displays a dramatic
contrast between dark basaltic plains and bright, heavily cratered highlands, recording a visible
history of the early solar system. Locked in synchronous rotation, it exerts a profound
gravitational influence on Earth, governing ocean tides and subtly stabilizing the planet’s axial
tilt.
Lunar Rover
The lunar rover rests on a desolate expanse of gray regolith, its rugged metal frame and dust-coated
wheels standing as a testament to human engineering beyond Earth. In the pitch-black sky above, the
distant Earth glows in blue and white, a fragile oasis suspended in space, emphasizing the vast
scale of the cosmos and the quiet persistence of exploration on the Moon’s barren surface.
Earth
The Blue Marble
Earth is the third planet from the Sun and the only astronomical object known to harbor life. With over 70%
of its surface covered by ocean, it supports a diverse biosphere and complex climate systems protected by a
magnetic field and atmosphere.
Diameter: 12,742 km
Day Length: 24 hours
Population: 8.2 billion
The Moon
Earth's Satellite
The Moon is Earth's only natural satellite. It is the fifth-largest satellite in the Solar System and the
largest among planetary satellites relative to the size of the planet that it orbits. Its gravitational
influence is the main driver of Earth's tides and very slowly lengthens Earth's day.
Diameter: 3,474 km
Distance: 384,400 km
Orbital Period: 27.3 days
Moon Surface
The Moon is a stark, airless world of ancient rock, its surface shaped by billions of years of
relentless impacts and volcanic activity. This natural satellite of Earth displays a dramatic
contrast between dark basaltic plains and bright, heavily cratered highlands, recording a visible
history of the early solar system. Locked in synchronous rotation, it exerts a profound
gravitational influence on Earth, governing ocean tides and subtly stabilizing the planet’s axial
tilt.
Lunar Rover
The lunar rover rests on a desolate expanse of gray regolith, its rugged metal frame and dust-coated
wheels standing as a testament to human engineering beyond Earth. In the pitch-black sky above, the
distant Earth glows in blue and white, a fragile oasis suspended in space, emphasizing the vast
scale of the cosmos and the quiet persistence of exploration on the Moon’s barren surface.
Earth
The Blue Marble
Earth is the third planet from the Sun and the only astronomical object known to harbor life. With over 70%
of its surface covered by ocean, it supports a diverse biosphere and complex climate systems protected by a
magnetic field and atmosphere.
Diameter: 12,742 km
Day Length: 24 hours
Population: 8.2 billion
The Moon
Earth's Satellite
The Moon is Earth's only natural satellite. It is the fifth-largest satellite in the Solar System and the
largest among planetary satellites relative to the size of the planet that it orbits. Its gravitational
influence is the main driver of Earth's tides and very slowly lengthens Earth's day.
Diameter: 3,474 km
Distance: 384,400 km
Orbital Period: 27.3 days
Moon Surface
The Moon is a stark, airless world of ancient rock, its surface shaped by billions of years of
relentless impacts and volcanic activity. This natural satellite of Earth displays a dramatic
contrast between dark basaltic plains and bright, heavily cratered highlands, recording a visible
history of the early solar system. Locked in synchronous rotation, it exerts a profound
gravitational influence on Earth, governing ocean tides and subtly stabilizing the planet’s axial
tilt.
Lunar Rover
The lunar rover rests on a desolate expanse of gray regolith, its rugged metal frame and dust-coated
wheels standing as a testament to human engineering beyond Earth. In the pitch-black sky above, the
distant Earth glows in blue and white, a fragile oasis suspended in space, emphasizing the vast
scale of the cosmos and the quiet persistence of exploration on the Moon’s barren surface.
Scene: Accretion Disk
efficiency. The Milky Way is a barred spiral galaxy containing 100–400 billion stars. At its center lies Sagittarius A*, a supermassive black hole around which the entire galaxy rotates.
Accretion Disk
Swirling Matter
An accretion disk is a structure formed by diffuse material in orbital motion around a massive central body. Friction and other forces cause the material to spiral inward, releasing immense potential energy as heat and light, often becoming the brightest objects in the universe.
Temp: 10^7 Kelvin
Rotation: 0.5c orbital speed
Friction: Viscous Heating
Black Hole X-ray Jet
Relativistic Beams
Astrophysical jets are beams of ionized matter ejected along the axis of rotation of a compact object, such as a black hole. When matter falls into a black hole, some of it is redirected by magnetic fields into powerful jets that travel at nearly the speed of light.
Speed: >99% light speed
Energy: X-rays & Gamma-rays
Origin: Magnetic Fields
Supermassive Black Hole
Sagittarius A*
A supermassive black hole is the largest type of black hole, with mass on the order of millions to billions of times the mass of the Sun. Most, if not all, galaxies are thought to contain a supermassive black hole at their centers, including Sagittarius A* at the center of the Milky Way.
Mass: 4.3 million Suns
Distance: 26,673 light-years
Diameter: 44 million km
Galaxy
The Milky Way
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The Milky Way is the galaxy that includes our Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky.