例句與造句

1. Both Eta Carinae and WR 102ka are believed likely to explode as supernovas or hypernovas within the next few million years.
2. Hypernovas have never been observed; however, a hypernova may have been the cause of the Ordovician Silurian extinction events.
3. Theorists surmise that such " hypernovas " may result from the violent merger of pairs of black holes or black holes with neutron stars.
4. A few longer-lasting gamma ray bursts, the more common type, have been observed in some detail by previous spacecraft . The afterglows, Nousek said, appear to support the hypothesis of immense stellar explosions, or hypernovas, as the most likely cause.
5. It's difficult to find hypernovas in a sentence. 用hypernovas造句挺難的