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EarthSky Voices
Interstellar visitor 3I/ATLAS might be oldest comet yet
Astronomers have modeled the path of interstellar comet 3I/ATLAS through the Milky Way galaxy. They said the comet might be 7 billion years old.
July 11, 2025
A deep-space navigation 1st, from New Horizons
New Horizons - which visited Pluto - has now performed a deep-space navigation 1st, determining its own position via star images.
July 11, 2025
Is the Milky Way teeming with satellite galaxies?
Astronomers used new models and simulations of the Milky Way to show our galaxy should have 80 to 100 more satellite galaxies than we've spotted.
July 10, 2025
Probing the Cosmic Dark Ages from the far side of the moon
Researchers are planning the CosmoCube mission to travel to the far side of the moon, an area of radio silence, to listen to whispers from the cosmic Dark Ages.
July 9, 2025
Airport radar could signal our existence to aliens
Airport radar leaks electromagnetic energy into space. These signals are strong enough that aliens 200 light-years away would be able to detect our presence.
July 8, 2025
Space
Earth could be in a void, Big Bang sound waves suggest
New research says sound waves from the Big Bang support the idea that Earth is in a huge void, which could explain the Hubble tension.
July 8, 2025
Phones and wifi block our view of our place in the universe
Astronomers help locate our place in the universe by analyzing the radio waves that come from black holes in the distant universe. But radio is getting crowded.
July 6, 2025
How do fireworks get their beautiful colors?
The red, orange, yellow, green, blue and purple colors exploding in the night sky during a fireworks festival are created by the use of metal salts.
July 4, 2025
Calculating whether an asteroid might hit Earth
How do scientists calculate the probability that an asteroid might hit Earth? And why does the likelihood often go up before dropping to zero?
July 4, 2025
Planet with a death wish triggers its own doom
Astronomers using ESA's Cheops mission have spotted a planet with a death wish. The exoplanet seems to be triggering flares of radiation from its parent star.
July 4, 2025
