# Cosmology

Cosmology is the study of the universe; its birth, evolution, and ultimate fate. This includes further developing and refining the prevailing model, the Big Bang theory, investigating the universe’s rate of expansion, and measuring radiation left over from the Big Bang, the so-called cosmic microwave background.

## Latest Research and Reviews

• Research
| Open Access

### Magnetised quark nuggets in the atmosphere

• T. Sloan
• , J. Pace VanDevender
•  & Haydn Jones
Scientific Reports 11, 22432
• Research |

### Transforming gas-rich low-mass disky galaxies into ultra-diffuse galaxies by ram pressure

Up to 40% of ultra-diffuse galaxies could have formed via stripping of material by ram pressure. A study on 11 low-mass post-starburst galaxies in the Coma and Abell 2147 clusters shows ubiquitous marks of ram-pressure stripping and recent star formation, and most of them will evolve into ultra-diffuse galaxies in the next 10 Gyr.

• Kirill A. Grishin
• , Igor V. Chilingarian
•  & Masafumi Yagi
• Research |

### Ultra-low-frequency gravitational waves from cosmological and astrophysical processes

While pulsar timing observations are currently unable to distinguish a binary black hole astrophysical foreground from a cosmological background, integrated bounds on the ultra-low-frequency gravitational wave spectrum from other cosmological probes may help to break this degeneracy.

• Christopher J. Moore
•  & Alberto Vecchio
• Research
| Open Access

### Cosmology in the mimetic higher-curvature $$f(R,R_{\mu \nu }R^{\mu \nu })$$ gravity

•  & Dominik Szczȩśniak
Scientific Reports 11, 18363
• Research |

### A gravitationally lensed supernova with an observable two-decade time delay

The discovery of a multiply imaged, probably of type Ia, supernova in a galaxy at redshift 1.95 enables a time-delay measurement with an uncertainty of <1%. The prediction that a new image will appear in the year 2037 ± 2 allows the use of this system as a cosmological probe.

• Steven A. Rodney
• , Gabriel B. Brammer
•  & Katherine E. Whitaker
Nature Astronomy 5, 1118-1125
• Reviews |

### The challenge of blending in large sky surveys

Blending occurs when multiple sources of light occupy the same region of the sky. This Perspective discusses the problems arising from blending for astrophysical and cosmological studies, and introduces the two main strategies for solutions.

• Peter Melchior
• , Rémy Joseph
•  & Daniel Gruen

## News and Comment

• News |

### Astrophysicists unveil glut of gravitational-wave detections

The latest bounty of 35 events features oddball black holes and a miniature neutron star.

• Davide Castelvecchi
• News |

### New type of dark energy could solve Universe expansion mystery

Hints of a previously unknown, primordial form of the substance could explain why the cosmos now seems to be expanding faster than theory predicts.

• Davide Castelvecchi
Nature 597, 460-461

### Knowing when to stop

When do we stop an ongoing science project to make room for something new? Decision-making is a complex process, ranging from budgetary considerations and tension between ongoing projects, to progress assessments and allowance for novel science developments.

• Ofer Lahav
•  & Joseph Silk
Nature Astronomy 5, 855-856
• News & Views |

### Back to the future with a supernova

A supernova, possibly of type Ia, gravitationally lensed by a massive cluster, is predicted to appear in the future. It has the potential to allow an independent, high-precision measurement of the Hubble constant.

• Anupreeta More
Nature Astronomy 5, 1094-1095
• News & Views |

### European Astronomical Society prizes 2021

The European Astronomical Society awarded its most prestigious prizes during its annual meeting held from 28 June to 2 July 2021. In a way similar to last year, the meeting was entirely virtual.

• Georges Meylan
Nature Astronomy 5, 988-990
• News & Views |

### Spinning around

The measured blue and redshifts of galaxies within filaments in the local Universe are consistent with the large-scale flow of matter within walls, but they may also point to evidence for their rotation.

• Katarina Kraljic
Nature Astronomy 5, 742-743