Universe is expanding 5-9 percent faster according to NASA
Q. Universe is expanding 5 to _______ percent faster than thought according to astronomers using NASA Hubble Space Telescope.- Published on 06 Jun 16a. 7
b. 8
c. 9
d. 10
ANSWER: 9
The Universe is expanding at the rate of 5-9 percent faster, scientists using NASA Hubble space telescope have discovered
- Researchers made the discovery by refining the universe’s current expansion rates to unprecedented accuracy, reducing uncertainty to 2.4 percent
- They looked for galaxies containing both Cepheid stars and Type Ia supernovae.
- Cepheid stars pulsate at rates that correspond to their true brightness, which can be compared with their apparent brightness as seen from Earth to accurately determine their distance.
- Type Ia supernovae, another commonly used cosmic yardstick, are exploding stars that flare with the same brightness and are brilliant enough to be seen from relatively longer distances.
- By measuring about 2,400 Cepheid stars in 19 galaxies and comparing the observed brightness of both types of stars, researchers accurately calculated distances to roughly 300 Type Ia supernovae in far-flung galaxies.
