@misc{indiciae5e53665eaf7b,
  title = {Has the space age stalled?},
  author = {Mark Alpert},
  year = {2002},
  doi = {10.1038/scientificamerican0402-18},
  url = {https://pubmed.ncbi.nlm.nih.gov/11905102/},
  note = {Source identifier: 11905102}
}