# Hsieh 2021: Evidence Suggesting That 'Oumuamua Is the ~30 Myr Old Product of a Molecular Cloud

> Cheng-Han Hsieh, Gregory Laughlin, Hector G. Arce, 2021. 5 records on Mysteries Department cite it. The young-age kinematic argument, which supports a…

Source: https://mysteriesdept.com/sources/SRC0CSKBMDR3PMT/evidence-suggesting-that-oumuamua-is-the-30-myr-old-product  
Publisher: Mysteries Department  
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[Sources](https://mysteriesdept.com/sources)[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)Hsieh 2021

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# Evidence Suggesting That 'Oumuamua Is the ~30 Myr Old Product of a Molecular Cloud

Cheng-Han Hsieh, Gregory Laughlin, Hector G. Arce, 2021. _The Astrophysical Journal_.

Compares the pre-encounter Galactic orbit with 50,899 F stars from Gaia DR2 and finds a dynamical age of about 35 million years, consistent with the Carina moving group; argues the implied number of such bodies is in tension with ejection from protoplanetary discs. ApJ 917, 20.

**1I/'Oumuamua** Articledoi: **[10.3847/1538-4357/ac0729](https://doi.org/10.3847/1538-4357/ac0729)** Checked against the original0

## What it's used for here

The young-age kinematic argument, which supports a molecular-cloud origin.

## Cited by on this site 5 records

[Born in a young stellar association such as the Carina or Columba moving groups, tens of millions of years…](https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKCH7M4GPK/born-in-a-young-stellar-association-such-as-the-carina-or)

Answer

ANS

[Kinematics suggest an age of about 35 million years and a link to a young moving group.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKCAMP21FT/kinematics-suggest-an-age-of-about-35-million-years-and-a)

Evidence

EVD

[The implied number of such bodies is in tension with ejection from protostellar discs in the candidate source…](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKCGZT4M0Q/the-implied-number-of-such-bodies-is-in-tension-with)

Evidence

EVD

[The orbit is consistent with Carina-group membership and a dynamical age of about 35 million years.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKCHFE30HX/the-orbit-is-consistent-with-carina-group-membership-and-a)

Evidence

EVD

[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)

The mystery article

MYS

## Cite it

```
Hsieh, C. H., Laughlin, G., & Arce, H. G. (2021). Evidence Suggesting That 'Oumuamua Is the ~30 Myr Old Product of a Molecular Cloud. The Astrophysical Journal. https://doi.org/10.3847/1538-4357/ac0729
```

[Read it free at doi.org](https://doi.org/10.3847/1538-4357/ac0729)

Key

**SRC** 0CSKBMDR3PMT

Kind

Journal article

Rights

The publisher's

Kept

27 Oct 2026, for editors

Checked

Against the published article

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Bibliographic records are CC0. Take this one as CSL-JSON, BibTeX or RIS.

[CSL-JSON](https://mysteriesdept.com/sources/SRC0CSKBMDR3PMT/evidence-suggesting-that-oumuamua-is-the-30-myr-old-product/csl.json)