| LOCKYER | Scientist who postulated the existence of helium in the Sun some 25 years prior to its discovery on Earth by William Ramsay and founded the journal Nature (7) |
| URANUS | Seventh planet from the sun some; times visible to the naked eye (6) |
| PAULI | "Wolfgang" who postulated the existence of the tiny neutrinos or "ghost particles" that have no size (5) |
| OORT | Dutch astronomer who first postulated the existence of a cloud in the most distant region of the solar system where long-period comets are thought to originate (4) |
| ABERGAVENNY | Where Rudolf Hess was held for three years prior to the Nuremberg trials (11) |
| ONEBC | Year 2,019 years prior to 2019 |
| REGENCY | Years prior to George IV's reign (7) |
| WYKEHAM | William of -; bishop who directed the reconstruction of the upper ward of Windsor Castle in 31 Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes plac |
| SODDY | Chemist who developed the theory of isotopes and assisted William Ramsay in the discovery of helium (5) |
| STAR | Any one of the 300 billion luminous bodies of hydrogen and helium in the Milky Way whose birth takes place inside a nebula (4) |
| GASMEN | They make you laugh, as they're supposed to check the helium in the air presumably (6) |
| HUBBLE | The first sophisticated orbital optical observatory. It was launched by the U.S. space shuttle Discovery on April 25, 1990. Among its many discoveries, it was also used to discover Hydra and Nix, two |
| THORPE | Jeremy ___, penultimate leader of the Liberal Party (1967-1976) prior to its 1988 merger with the SDP (6) |
| PAUL | Scientist who first postulated the neutrino's existence |
| STONE | The kernel of an apricot, cherry, peach, plum or other drupe fruit; a gem such as a diamond; or, a rock as a weight prior to its standardisation as an imperial unit of 14lbs (5) |
| PRESENTATION | An act of bestowing an award, gift, honour or prize; the manner in which something is displayed; a seminar, show-and-tell or speech; or, a baby's position prior to its birth (12) |
| CHINASTONE | Clay extracted near St Austell; its discovery crucially developed the manufacture of English porcelain |
| RELOADED | Status of The Matrix prior to its Revolutions (8) |
| SEARCHFEE | Solicitor's charge for checking planning issues which may affect the property's value prior to its sale (6,3) |
| NEMESIS | What is the name of the hypothetical red or brown dwarf star orbiting the sun. postulated by two teams of astronomers including Piet Hut and Marc Davis? (7) |
