Dubai Astronomy Group
A Journey Through
The Cosmos
From our fragile blue home to the faintest echo of creation — scroll to travel the full scale of the universe, one step at a time.
Earth
The Pale Blue Dot
Our home. Seen from space, it is a fragile sphere of blue and white — the only world in the known universe confirmed to harbour life. Over 4.5 billion years, Earth evolved from a molten rock into an ocean-draped world wrapped in a life-sustaining atmosphere. That thin shell of air, stretching barely 100 km above us, is the only thing standing between us and the vacuum of space.
The Moon
Earth's Faithful Companion
Earth's only natural satellite, and the only world beyond our own ever walked by human feet. The Moon was born in catastrophe — a Mars-sized body called Theia is thought to have collided with early Earth, flinging debris into orbit that coalesced into the Moon we see today. Without it, Earth's axial tilt would be far less stable, and complex life may never have emerged.
Mercury
The Swift Planet
The smallest planet and the closest to the Sun, Mercury is a world of dramatic extremes. Its cratered surface looks much like our Moon — battered by billions of years of impacts with almost no atmosphere to protect it. Without air to retain heat, temperatures swing more than 600 degrees between day and night. Most strangely: a single day on Mercury is longer than its entire year.
Venus
The Veiled Planet
Often called Earth's twin because of its similar size and mass, Venus is in reality a vision of hell. Its dense atmosphere of carbon dioxide and sulphuric acid clouds has triggered a runaway greenhouse effect, making it the hottest planet in the solar system — hotter even than Mercury. Venus also rotates backwards and so slowly that the Sun rises in the west and sets in the east.
Mars
The Red Planet
Rust-coloured and hauntingly Earth-like, Mars holds the solar system's tallest volcano — Olympus Mons, three times the height of Everest — and a canyon system, Valles Marineris, as wide as the continental United States. Evidence of ancient rivers and lakes suggests Mars was once warm and wet. Today, robotic rovers search its rust-red dust for signs that life once took hold there.
Jupiter
The Great Giant
Jupiter is not merely the largest planet — it is larger than all other planets combined, with over 1,300 Earths fitting inside it. Its Great Red Spot, a storm wider than Earth itself, has raged for at least 350 years. Jupiter's immense gravity acts as a cosmic shield, deflecting or absorbing many asteroids and comets that might otherwise threaten the inner solar system — and life on Earth.
Saturn
Lord of the Rings
Nothing in the solar system prepares you for Saturn. Its rings — made of billions of ice and rock particles — span up to 282,000 km across, yet are often less than 10 metres deep. Saturn is the least dense planet in the solar system; it would float on water. Its moon Titan is the only moon with a thick atmosphere and has lakes of liquid methane pooled on its surface.
Uranus
The Tilted World
Uranus rolls through space almost completely on its side, tilted at 97.8 degrees — almost certainly the result of a violent collision with an Earth-sized body billions of years ago. This extreme tilt means each pole endures 42 years of continuous sunlight followed by 42 years of total darkness. An ice giant rather than a gas giant, its interior is made of water, methane, and ammonia ices beneath a hydrogen atmosphere.
Neptune
The Windy Giant
The most distant major planet was discovered not through observation, but through pure mathematics. Astronomers noticed irregularities in Uranus's orbit, calculated where an unseen planet must be, and found Neptune exactly where the equations predicted. Despite receiving 900 times less sunlight than Earth, Neptune generates fierce internal heat, driving winds of up to 2,100 km/h — the fastest in the solar system.
The Solar System
Our Sun and its family
Step back far enough and our entire planetary family shrinks into a single view. Eight planets, 290+ moons, millions of asteroids, and countless comets all orbit a single star. But the solar system doesn't end at Neptune. The Oort Cloud — a vast, spherical shell of icy bodies — extends nearly two light-years from the Sun. Voyager 1, launched in 1977, only crossed the edge of the heliosphere in 2012.
The Milky Way
One of Two Trillion Galaxies
Pull back far enough and our entire solar system shrinks to invisibility — just one of 100 to 400 billion stars orbiting the centre of the Milky Way. Our Sun lies on the Orion Arm, a minor spiral arm about 26,000 light-years from the galactic core. At the heart of the Milky Way lurks Sagittarius A*, a supermassive black hole 4 million times the mass of our Sun.
The Local Group
Our Galactic Neighbourhood
The Milky Way is not alone. It belongs to a family of over 80 galaxies called the Local Group, spanning about 10 million light-years. The dominant neighbour is the Andromeda Galaxy (M31), 2.5 million light-years away and visible to the naked eye from a dark site. Andromeda and the Milky Way are on a slow collision course. In about 4.5 billion years they will merge — forming a new elliptical galaxy astronomers have nicknamed "Milkomeda."
The Observable Universe
Everything we can ever see
Every single dot of light in this Hubble image is not a star — it is an entire galaxy, each home to hundreds of billions of stars. The observable universe — the sphere from which light has had time to reach us in 13.8 billion years — contains an estimated 2 trillion galaxies. And this is only the portion we can observe. The full universe beyond our horizon may be vastly larger. Perhaps infinite.
The Cosmic Microwave
Background
The First Light in the Universe
This is as far back as light can take us. The Cosmic Microwave Background is the faint thermal afterglow of the Big Bang — radiation that filled the universe 380,000 years after creation, when the cosmos cooled enough for atoms to form and light to travel freely for the first time. The tiny temperature fluctuations across this map — just 0.00001°C — are the seeds from which all galaxies, stars, planets, and we ultimately grew.
"We are made of star stuff."
— Carl Sagan
Every atom in your body was forged inside a dying star. The iron in your blood came from supernovae that exploded billions of years before Earth existed. The calcium in your bones was scattered across the cosmos and eventually found its way here. You are not separate from the universe — you are the universe, looking back at itself and asking why.
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