Physics

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Which of the following are most massive and luminous? A) RR Lyrae variables B) brown dwarfs C) ... Started by dbose	1 Replies 58 Views	Jul 27, 2018 by fur
Primordial nucleosynthesis implies the Big Bang makes all elements up to iron. Indicate whether ... Started by SAVANNAHHOOPER23	1 Replies 90 Views	Jul 27, 2018 by firehawk60
From coolest to hottest, the seven letters for the star types are ________. Fill in the blank(s) ... Started by sabina	1 Replies 97 Views	Jul 27, 2018 by momo1250
The Big Bang has time in primordial nucleosynthesis to make only H and He in abundance. Indicate ... Started by SAVANNAHHOOPER23	3 Replies 94 Views	Jul 27, 2018 by flexer1n1
A star in the instability strip of the H-R diagram would A) explode as a Type I supernova. B) ... Started by K@	1 Replies 66 Views	Jul 27, 2018 by ky860224
In the Big Bang, about 75 of the normal matter by mass was hydrogen atoms, and the other 25 almost ... Started by armygirl	1 Replies 85 Views	Jul 27, 2018 by Tabitha_2016
Only type O stars are hot enough to show ionized ________ in their spectra. Fill in the blank(s) ... Started by colton	1 Replies 98 Views	Jul 27, 2018 by mceravolo
The unusually bright centers found in some galaxies are called ________. A) halos B) active ... Started by jparksx	3 Replies 103 Views	Jul 27, 2018 by hramirez205
Arcturus, the brightest star of spring skies, is spectral type K, so to us it appears ________ in ... Started by khang	1 Replies 75 Views	Jul 27, 2018 by mirabriestensky
Almost all the helium in the universe was formed between 2-15 minutes after the Big Bang. ... Started by burchfield96	1 Replies 74 Views	Jul 27, 2018 by krakiolit
Which of these variable stars would be classified as an RR Lyrae? A) a pulsar with a period of ... Started by khang	1 Replies 103 Views	Jul 27, 2018 by Christopher
If Mars' atmosphere is mostly carbon dioxide, why isn't it as hot as Venus? What will be an ideal ... Started by viki	3 Replies 125 Views	Jul 27, 2018 by blakcmamba
The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is ... Started by pane00	1 Replies 82 Views	Jul 27, 2018 by lou
Deuterium abundance suggests that normal matter makes up only 3-4 of the critical density. ... Started by darbym82	1 Replies 57 Views	Jul 27, 2018 by micaelaswann
The location of the Galactic Center was first found by Harlow Shapley with A) radio emissions ... Started by dakota nelson	1 Replies 96 Views	Jul 27, 2018 by jrpg123456
Describe the relation between Mercury's spin and orbit. What will be an ideal ... Started by michelleunicorn	3 Replies 123 Views	Jul 27, 2018 by 234sdffa
Why is the atmospheric pressure at the surface of Venus so much higher than Earth's? What will be ... Started by ashley	1 Replies 125 Views	Jul 27, 2018 by 234sdffa
Stars of the main sequence, like our own, are all converting ________ into helium. Fill in the ... Started by tth	1 Replies 73 Views	Jul 27, 2018 by chinwesucks
The period-luminosity relation is critical in finding distances with A) Cepheid variables. B) ... Started by bobbie	1 Replies 108 Views	Jul 27, 2018 by blakcmamba
There is a superforce that separates into the electromagnetic, weak, and strong nuclear forces below ... Started by Tazate	3 Replies 246 Views	Jul 27, 2018 by jaygar71
Where on the H-R diagram are the majority of stars that dominate the night sky? What will be an ... Started by jeatrice	1 Replies 60 Views	Jul 27, 2018 by babybsemail
Hubble's galaxy classification diagram (the tuning fork) ________. A) suggests the existence of ... Started by JMatthes	1 Replies 98 Views	Jul 27, 2018 by babybsemail
In the GUT, electromagnetism and the strong nuclear force are the last to appear. Indicate ... Started by laurencescou	1 Replies 127 Views	Jul 27, 2018 by ttt030911
Harlow Shapley found the Milky Way was A) uniformly spherical in shape. B) rapidly expanding. ... Started by amal	3 Replies 119 Views	Jul 27, 2018 by kiamars2010
Using the technique of main-sequence fitting to determine the distance to a star cluster requires ... Started by Capo	1 Replies 72 Views	Jul 27, 2018 by yuyiding