Problem Area | Remarks |

Hubble Tension | 4 σ - 6σ Possible Modeling or Systematic Error or failure in Lambda CDM, Possible error in Standardising candles |

Lensing Anomaly | Possible Systematic Error/Positive Curvature/Closed Universe |

Accelerated Expansion | Astrophysical Observations/Possibly New Explanations |

CDM | Theoretical necessity (CMB observations) |

Dark Matter | Theoretical necessity/Astrophysical Observations |

Dark Energy | Theoretical Necessity/Astrophysical Observations |

Inflation | Patchwork to SMC based on CMB and Astrophysical Observations/Debatable. Needs explanations and more evidence |

Conformal Cyclic Cosmology | Alternative to inflation/Mathematically and aesthetically appealing/Needs more evidence and theoretical work |

Giant Arc | New Explanations needed |

Lepton Universality Violation | New Explanations needed |

Energy Density ~0 (>0) | New Explanations needed |

Critical Mass Density (~1) | New Explanations needed |