Exoplanets: Worlds Beyond Our Solar System
Thousands of planets orbiting distant stars - some might harbor life
The Exoplanet Revolution
🌍Potentially Habitable Worlds
These planets orbit in the "habitable zone" where liquid water could exist - the key ingredient for life as we know it.
Proxima Centauri b
4.24 light-yearsIn habitable zone, but stellar flares may be problematic
TRAPPIST-1e
40 light-yearsBest candidate in TRAPPIST-1 system
Kepler-442b
1,206 light-years61% chance of being in habitable zone
Kepler-452b
1,400 light-yearsEarth's 'older cousin'
LHS 1140 b
40 light-yearsOne of the best candidates for atmospheric studies
TOI-700 d
101 light-yearsIn conservative habitable zone
K2-18 b
124 light-yearsWater vapor detected in atmosphere (2019)
Kepler-186f
582 light-yearsFirst Earth-sized planet in habitable zone
🌪️Exotic & Extreme Worlds
HD 189733 b
Deep blue color due to silicate particles in atmosphere that scatter blue light. Winds exceed 2 km/s.
PSR B1620-26 b
Oldest known planet, formed when universe was only 1 billion years old. Orbits a binary star system in globular cluster M4.
TrES-2b
Reflects less than 1% of light that hits it - darker than coal. Hot Jupiter with temperature of 980°C.
HD 106906 b
Orbits 650 AU from its star on a highly inclined, eccentric orbit. May help explain Planet Nine theories.
Kepler-16b
Orbits two stars, like Star Wars' Tatooine. Saturn-sized gas giant in a circumbinary orbit.
KELT-9b
Day side temperature exceeds 4,000°C - hotter than some stars. Molecules break apart into atoms.
GJ 504 b
Glows magenta due to infrared heat from its formation. 4x Jupiter's mass, only 160 million years old.
HAT-P-7b
Atmospheric conditions allow corundum (rubies/sapphires) to condense and fall as 'rain'.
Types of Exoplanets
Hot Jupiters
Gas giants orbiting very close to their stars
Super-Earths
Rocky planets larger than Earth but smaller than Neptune
Ocean Worlds
Planets potentially covered entirely in liquid water
Lava Planets
Rocky worlds so hot their surfaces are molten
How We Find Exoplanets
Transit Method
Detects dip in star's brightness when planet passes in front
Can determine planet size and orbital period
Requires precise alignment
Radial Velocity (Doppler)
Detects star's wobble caused by planet's gravity
Can determine planet mass
Better for large, close-in planets
Direct Imaging
Photographs planets directly
Can study planet's atmosphere and orbit
Only works for large planets far from bright stars
Gravitational Microlensing
Planet's gravity bends light from background star
Can detect distant planets and free-floating planets
Events are unrepeatable and brief
Historic Milestones
🔮 Future of Exoplanet Discovery
J W S T
Studying exoplanet atmospheres in unprecedented detail
R O M A N T E L E S C O P E
Will discover thousands more exoplanets via microlensing (launch 2027)
A R I E L
ESA mission to study exoplanet atmospheres (launch 2029)
P L A T O
Will search for Earth-like planets around Sun-like stars (launch 2026)
H A B I T A B L E W O R L D S O B S E R V A T O R Y
NASA concept to directly image Earth-like exoplanets
The Search Continues
Every day we discover new worlds orbiting distant stars. Some might have conditions suitable for life. The James Webb Space Telescope is now studying their atmospheres in unprecedented detail, searching for signs of life beyond Earth. We may be on the verge of answering humanity's oldest question: Are we alone?