- Galaxy evolution: galaxies/IGM connection.
- Absorption lines: QSO and GRB absorption lines (spectroscopy).
- Large scale structure: voids, filaments, groups, clusters.
- Cosmology: dark matter, dark energy (?).
"Believe nothing on the faith of traditions,
even though they have been held in honor
for many generations and in diverse places.
Do not believe a thing because many people speak of it.
Do not believe on the faith of the sages of the past.
Do not believe what you yourself have imagined,
persuading yourself that a God inspires you.
Believe nothing on the sole authority of your masters and priests.
After examination, believe what you yourself have tested
and found to be reasonable, and conform your conduct thereto."