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“Cosmic rays, mostly”

The verified answer to the Newsday Crossword clue “Cosmic rays, mostly”, with letter-by-letter analysis and the full puzzle context for the Thursday, September 10, 2026 puzzle.

Published · Across · 4 letters

Hints first

Letters 4
First letter I
Last letter S
I ? ? S

A 4-letter across entry from the Thursday puzzle

The Answer

I O N S

The answer to “Cosmic rays, mostly” is IONS

Letters 4
Direction Across
Published Sep 10, 2026

Letter analysis: the 4-letter answer

Vowels, consonants, and crossword construction notes
Unique 4 of 4 positions
Vowels 2 50% of word
Consonants 2 non-vowels
First letter I starts with

The clue “Cosmic rays, mostly” appeared in the Newsday Crossword on Thursday, September 10, 2026 as a across entry. The verified answer is IONS — a 4-letter word that begins with I and ends with S.

This answer contains 2 vowels and 2 consonants. The Newsday Crossword is published daily by Newsday on Long Island and edited by Stan Newman, whose Saturday Stumper is widely considered one of the toughest mainstream crosswords in print.

Other clues with the answer IONS

IONS has been used as the answer for these Newsday Crossword clues
“Atoms with a charge” Jun 23, 2026 “Charged atoms” Jun 1, 2026 “Charged particles” Apr 7, 2026 “Subatomic topic” Mar 27, 2026 “Charged atoms” Jan 18, 2026 “Atoms with charges” Dec 21, 2025 “Charged particles” Dec 14, 2025 “Air purifier output” Nov 15, 2025 “Charged atoms” Jul 14, 2025 “Smoke detector output” Apr 6, 2025 “Atoms with a charge” Feb 12, 2025

More clues from the September 10, 2026 puzzle

Thursday Newsday Crossword
View full puzzle
Express discontent 4 ℓ · D Brewery unit 3 ℓ · D Hammering sound 4 ℓ · D Tennis swing 6 ℓ · D Triathlon segment 3 ℓ · A Leading lady of song 4 ℓ · D Is always defeating 4 ℓ · D Sheriff's identifier 5 ℓ · A Gridiron quorum 6 ℓ · D Slithery swimmer 3 ℓ · D Tech "Squad" member 4 ℓ · D Note with an XOXO ending 10 ℓ · D Troublemaker of folklore 7 ℓ · D Way away 4 ℓ · D Combustion evidence 5 ℓ · A Former Google exec Schmidt 4 ℓ · D Burning 5 ℓ · A Poolside handout 5 ℓ · A Mineral-packed rock 3 ℓ · A Certain seedless citrus 11 ℓ · A

Frequently asked questions about “Cosmic rays, mostly”

What is the answer to “Cosmic rays, mostly” in the Newsday Crossword?

The verified answer is IONS — a 4-letter word that appeared as a across entry on Thursday, September 10, 2026.

How many letters is the answer to “Cosmic rays, mostly”?

The answer IONS contains 4 letters.

Was “Cosmic rays, mostly” an across or down clue?

This clue ran as a Across entry.

Is this site affiliated with Newsday?

No. This is an independent fan reference site — we are not affiliated with Newsday. The Newsday Crossword is a trademark of its respective owner. We solve and verify each Newsday Crossword puzzle manually before publishing the answer key.

Cosmic rays, mostly — Newsday Crossword Clue Answer | Newsday Crossword Answers