Free tools Windows power users keep installed
One-click scans. No signup required.
The first sugar reported in the interstellar medium was glycolaldehyde (CH2OHCHO), detected in 2000 toward Sagittarius B2(N), a molecular cloud near the center of the Milky Way. Astronomers identified it from millimeter-wave emissions—not from a picture of sugar. The milestone remains historical: a July 2026 paper later reported a different, four-carbon sugar, erythrulose, in another study of interstellar chemistry.
What was the first sugar detected in space?
In a 2000 paper, J. M. Hollis, F. J. Lovas, and P. R. Jewell reported glycolaldehyde in emission toward Sagittarius B2(N), a molecule-rich region in the Galactic Center. They described glycolaldehyde as the simplest possible sugar and the first sugar reported in interstellar clouds. Their report established the historical first; it does not mean glycolaldehyde is the only sugar-like molecule since found in interstellar space.
As an Amazon Associate I earn from qualifying purchases.
“Interstellar medium” means the gas and dust between stars. The result was a molecular identification in that material, not a detection of table sugar, sweetness, or a solid sugar crystal.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →How did astronomers identify glycolaldehyde?
They matched a pattern of radio spectral lines
Molecules rotate in ways that produce emissions or absorptions at characteristic frequencies. Astronomers compare signals from space with laboratory measurements of those frequencies. A match across multiple transitions can support an identification; it is not a direct image of an intact molecule. Laboratory measurements of glycolaldehyde’s characteristic radio wavelengths were also important to the later identification described by ALMA. ALMA’s account of that observation explains this role.
#1 Best Overall
The 2000 observations
Hollis, Lovas, and Jewell used the NRAO 12 m telescope, observing Sagittarius B2(N) from May 25 to 31, 2000. Their search selected six strong transitions of the lowest-energy glycolaldehyde conformer in the 3 mm wavelength range. The original paper reports the target, method, and result.
Why follow-up matters
A later systematic survey of Sagittarius B2(N) examined 40 favorable glycolaldehyde transitions between 68 and 169 GHz. It reported emission at 38 transition frequencies, but only 21 percent of the detected lines appeared as distinct individual features; the rest were blended with or contaminated by emission from other molecules. The authors said the combined observations supported glycolaldehyde’s presence and underscored the need for extensive, self-consistent data when identifying complex molecules in crowded spectra. The follow-up study provides those qualifications.
Rank #2
How the later sugar findings differ
| Milestone | Molecule and structure | Location | What the report established |
|---|---|---|---|
| 2000, historical first | Glycolaldehyde (CH2OHCHO), a two-carbon hydroxyaldehyde; the original authors called it the simplest possible sugar. | Sagittarius B2(N), Galactic Center region. | Reported in emission using millimeter-wave rotational transitions observed with the NRAO 12 m telescope. Hollis, Lovas, and Jewell (2000). |
| 2012, a new setting for glycolaldehyde | Glycolaldehyde. | Gas surrounding the young Sun-like binary protostar IRAS 16293-2422. | ALMA described this as the first detection so near a Sun-like star, at a scale comparable to the Sun–Uranus distance. It was not the first interstellar detection. ALMA announcement. |
| 2022, related chemistry | (Z)-1,2-ethenediol, the enol form of glycolaldehyde. | G+0.693-0.027. | The study modelled 18 unblended or slightly blended transitions and reported a column density of (1.8 ± 0.1) × 1013 cm−2. This is a related species, not a replacement for the 2000 first. Rivilla et al. (2022). |
| July 2026, a different sugar report | Erythrulose, a chiral four-carbon ketose. | G+0.693-0.027. | The paper reports erythrulose in the interstellar medium using broadband spectral surveys with the Yebes 40 m and IRAM 30 m telescopes. Its authors describe it as a sugar detected in the ISM. Jiménez-Serra et al. (2026). |
The 2026 journal record also lists a correction. Because its precise changes need to be checked against the corrected paper, detailed 2026 measurements are not included here. Nature Astronomy correction record.
What the discovery says—and what it does not
Finding glycolaldehyde and other sugar-related molecules in interstellar gas is relevant to astrochemistry and prebiotic chemistry: it shows that molecules associated with sugar chemistry exist beyond Earth. It does not show that life exists elsewhere, that RNA formed in space, or that these molecules reached early Earth.
Rank #3
The original authors discussed formaldehyde polymerization as one possible route to glycolaldehyde, while noting that there was no consensus on how complex interstellar molecules form. For erythrulose, the 2026 authors propose a route on interstellar dust grains from simpler two-carbon aldehydes and alcohols, based on quantum-chemical and astrochemical models. That is a model-supported pathway, not a directly observed sequence of reactions.
In the separate 2012 protostar result, lead author Jes Jørgensen called glycolaldehyde “one of the ingredients in the formation of RNA.” That comment describes chemical relevance, not a detection of RNA or life; it concerned IRAS 16293-2422, not the original Sagittarius B2(N) observation. The ALMA announcement gives the context.
Quick Recap
Rank #4
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
