- (A) Nitric oxide
- (B) Nitrogen dioxide
- (C) Nitrogen pentoxide
- (D) Nitrous oxide
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- (A) Helium
- (B) Hydrogen
- (C) Oxygen
- (D) Nitrogen
- (A) Speedometer
- (B) Anemometer
- (C) Odometer
- (D) Hygrometer
- (A) Oxygen and Hydrogen
- (B) Hydrogen and Sulfur
- (C) Carbon and Silicon
- (D) Hydrogen and Helium
- (A) Quasars Star
- (B) Pulsars Star
- (C) White Dwarfs Star
- (D) Red Super-giants Star
- (A) Alpha Stage
- (B) Stellar Genesis
- (C) Protostar
- (D) Star of Adam
- (A) Stellar nurseries
- (B) Star clouds
- (C) Event horizons
- (D) Singularities
- (A) Black hole
- (B) Red giant
- (C) Quasar
- (D) Pulsar
- (A) White dwarf
- (B) Blue giant
- (C) Wolf-Raynet star
- (D) Black hole
- (A) Wolf-Rayet star
- (B) Red supergiant
- (C) Stellar storm
- (D) Pulsar
