Space
A star called ‘Earendel’ could be the most distant ever seen
A thin red arc found in an image from the Hubble Space Telescope shows starlight from nearly 13 billion years ago.
By Liz Kruesi
HS-ESS1-2
Construct an explanation of the Big Bang theory based on astronomical evidence of light spectra, motion of distant galaxies, and composition of matter in the universe.
More Stories in HS-ESS1-2
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PlanetsAnalyze This: Some 5,000 planets orbit stars other than our sun
A new cache of confirmed exoplanet discoveries marks a milestone in planets found beyond our solar system.
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EarthScientists Say: Atmosphere
An atmosphere is an envelope of gas around a planet, dwarf planet or moon.
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SpaceScientists Say: Constellation
Constellations are clusters of related things, especially the stars that form patterns in the night sky — some of which date back to ancient times.
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PlanetsMercury’s surface may be studded with diamonds
Billions of years of meteorite impacts may have transformed much of Mercury's graphite crust into precious gemstones.
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PlanetsLet’s learn about Pluto
Once known as a pipsqueak planet, Pluto is now the solar system’s best known dwarf planet.
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PhysicsScientists Say: Doppler effect
The Doppler effect is a perceived change in the frequency of light or sound waves due to the wave source moving relative to an observer.
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PhysicsScientists Say: Dark Energy
Dark energy is the unknown force causing the universe to expand faster and faster.
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SpaceWild art? No, it’s a radio image of the heart of our Milky Way
Eyelash-like radio filaments accent the brightest feature in this image — a supermassive black hole.
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PlanetsNo, organic molecules alone don’t point to life on Mars
These carbon-based molecules, found in a meteorite, may reflect merely a mixing of water and minerals on the Red Planet over billions of years.