. Hubble space telescope hascaptured, for the first time, detailedimage of surface of a distant star.Name of the star [UPPCS (Pre) 1995](A) Virgo (B) 70 Virgins(C) Betelgeuse (D) Big Dipper15. ‘Light Year’ is the unit of[MPPCS (Pre) 1994](A) Time (B) Distance(C) Luminosity (D) None of these16. Which one of the following is not anatural unit of time?[Uttarakhand PCS (Pre) 2016](A) Tropical year(B) Lunar month(C) Standard time(D) Day17. The unit of measuring distancebetween the stars is known as[Uttarakhand PCS (Pre) 2006](A) Stellar mile (B) Cosmic km.(C) Galectic unit (D) Light year18. If the stars are seen to riseperpendicular to the horizon by anobserver, he is located on the[IAS (Pre) 2001](A) Equator(B) Tropic of Cancer(C) South Pole(D) North Pole19. A person stood alone in a desert ona dark night and wanted to reachhis village which was situated 5km East of the point where he wasstanding. He had no instrument tofind the direction but he located thepole star. The most convenient waynow to reach his village is to walk inthe [IAS (Pre) 2012](A) Direction facing the pole star(B) Direction opposite to the polestar(C) Direction keeping the pole starto his left(D) Direction keeping the pole starto his rightWorldGeography3

Estimate the age of the universe in seconds using the Hubble constantH0 = 70 km s–1 Mpc–1.

Our solar system formed ______ billion years after the big bang.*1 point156914

41. Light year is a unit of(1) time (2) distance(3) sunlight intensity (4) mass

19)The Hubble Space Telescope (HST) is projected to maintain operation until at least 2030, but it has already revolutionized high-resolution imaging of solar-system bodies in visible and ultraviolet (UV) light wavelengths, notwithstanding that only about 6% of the bodies imaged by the HST are within the solar system. NASA researcher Cindy L. Young and colleagues assert that a new space telescope dedicated exclusively to solar-system observations would permit an extensive survey of minor solar-system bodies and long-term UV observation to discern how solar-system bodies change over time. Young and colleagues' recommendation therefore implies that the HST ______ Which choice most logically completes the text?IFRPRAEN-019will likely continue to be used primarily to observe objects outside the solar system.will no longer be used to observe solar system objects if the telescope recommended by Young and colleagues is deployed.can be modified to observe the features of solar system objects that are of interest to Young and colleagues.lacks the sensors to observe the wavelengths of light needed to discern how solar system bodies change over time.

Which of the following distances represents an astronomical unit? athe distance between Earth and the moon bthe distance between the sun and Earth cthe distance across the entire solar system dthe distance across the Milky Way galaxy