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Space Facts

Stars & Galaxies Facts

Explore surprising facts and verified stats about Stars & Galaxies. Find memorable numbers, records, comparisons, and bite-size trivia that help you understand this topic quickly and share it with confidence.

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The cosmic microwave background is ~2.7 K
Science Physics
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The cosmic microwave background is ~2.7 K

Shahzad Mahota Published By Shahzad Mahota @shahzad-mahota
A neutron star is only about 20 kilometers across
Space Space Discoveries
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A neutron star is only about 20 kilometers across

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A supernova can briefly outshine its whole galaxy
Space Stars & Galaxies
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A supernova can briefly outshine its whole galaxy

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A white dwarf can pack a Sun’s mass into an Earth-sized ball
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A white dwarf can pack a Sun’s mass into an Earth-sized ball

Shahzad Mahota Published By Shahzad Mahota @shahzad-mahota
The cosmic microwave background is leftover light from the Big Bang
Space Space Discoveries
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The cosmic microwave background is leftover light from the Big Bang

Shahzad Mahota Published By Shahzad Mahota @shahzad-mahota
Nothing can escape once past a black hole’s event horizon
Space Black Holes
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Nothing can escape once past a black hole’s event horizon

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The Chandrasekhar limit is about 1.4 solar masses
Science Physics
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The Chandrasekhar limit is about 1.4 solar masses

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The Sun converts about 4 million tons of mass to energy every second
Science Physics
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The Sun converts about 4 million tons of mass to energy every second

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A teaspoon of a neutron star would weigh about 6 billion tons
Science Physics
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A teaspoon of a neutron star would weigh about 6 billion tons

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Betelgeuse could swallow the orbit of Mars
Space Stars & Galaxies
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Betelgeuse could swallow the orbit of Mars

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Sagittarius A* weighs about 4 million Suns
Space Black Holes
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Sagittarius A* weighs about 4 million Suns

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The Milky Way is about 100,000 light-years across
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The Milky Way is about 100,000 light-years across

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The Sun holds about 99.8% of the solar system’s mass
Space Solar System
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The Sun holds about 99.8% of the solar system’s mass

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The observable universe is about 93 billion light-years across
Science Physics
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The observable universe is about 93 billion light-years across

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There are about 10²² to 10²⁴ stars in the observable universe
Science Physics
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There are about 10²² to 10²⁴ stars in the observable universe

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Proxima Centauri is the nearest star beyond our Sun
Space Stars & Galaxies
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Proxima Centauri is the nearest star beyond our Sun

Shahzad Mahota Published By Shahzad Mahota @shahzad-mahota
The Milky Way and Andromeda are on a collision course
Space Stars & Galaxies
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The Milky Way and Andromeda are on a collision course

Shahzad Mahota Published By Shahzad Mahota @shahzad-mahota
Sunlight takes about 8 minutes to reach Earth
Space Astronomy Basics
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Sunlight takes about 8 minutes to reach Earth

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One light-year is about 9.5 trillion kilometers
Space Astronomy Basics
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One light-year is about 9.5 trillion kilometers

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A Fermi paradox asks: where is everybody?
Science Physics
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A Fermi paradox asks: where is everybody?

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Space Telescopes
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Pulsar timing arrays listen for nanohertz gravitational waves

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Space Telescopes
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Interferometry baselines turn separated dishes into one sharp eye

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Space Telescopes
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Euclid maps dark matter by surveying billions of galaxies

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Space Exoplanets
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TRAPPIST-1 hosts seven Earth-size planets

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Space Astronomy Basics
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Spectroscopy fingerprints composition while redshift clocks recession

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Stars & Galaxies