Physics

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The first cells must have been simple, single-celled organisms similar to modern _______________. ... Started by Mimi	1 Replies 97 Views	Jul 27, 2018 by mirabriestensky
About 540 million years ago, a sudden increase in biological complexity occurred, known as the ... Started by aabwk4	1 Replies 133 Views	Jul 27, 2018 by Mollythedog
Jupiter's moon _______________ appears to have a liquid-water ocean below its icy crust and may ... Started by olgavictoria	3 Replies 107 Views	Jul 27, 2018 by Jossy
In 1974, astronomers sent an anticoded message as a string of 1679 _______________ and ... Started by ARLKQ	1 Replies 77 Views	Jul 27, 2018 by katkat_flores
What makes silicon an unlikely source as the basis of life? What will be an ideal ... Started by lracut11	1 Replies 40 Views	Jul 27, 2018 by sailorcrescent
Why couldn't life have originated on the Moon or Mercury? What will be an ideal ... Started by jc611	1 Replies 73 Views	Jul 27, 2018 by kingdude89
What is the radio window astronomers use to search for alien transmitted communication? What is this ... Started by Kthamas	3 Replies 107 Views	Jul 27, 2018 by epscape
Was oxygen a part of Earth's early atmosphere? Explain how today's atmosphere evolved to support ... Started by CharlieWard	1 Replies 176 Views	Jul 27, 2018 by welcom1000
Why can't we send a space mission to a star system outside of our own? What will be an ideal ... Started by yoroshambo	1 Replies 97 Views	Jul 27, 2018 by sierramartinez
How many centimeters are there in one kilometer? a. 100 b. 1,000 c. 10,000 d. 100,000 e. ... Started by RODY.ELKHALIL	1 Replies 48 Views	Jul 27, 2018 by Animal_Goddess
The diameter of a typical star (the Sun) is approximately ____ times larger than the diameter of a ... Started by newbem	3 Replies 160 Views	Jul 27, 2018 by dudman123
The radius of the Moon's orbit is about ____ times larger than the radius of Earth. a. 0.6 b. 6 ... Started by humphriesbr@me.com	1 Replies 167 Views	Jul 27, 2018 by steff9894
2.9107 is the same as a. 2.9 thousand. b. 29 thousand. c. 290 thousand. d. 2.9 million. e. 29 ... Started by oliviahorn72	1 Replies 119 Views	Jul 27, 2018 by Mholman93
Arrange the following distances in order from smallest to largest. I. kilometer II. light-year III. ... Started by cookcarl	1 Replies 141 Views	Jul 27, 2018 by Mochi
If distance is speed time and light takes 8 minutes to travel from the Sun to Earth and over 4 ... Started by lak	3 Replies 213 Views	Jul 27, 2018 by batool
The speed of light is 3.0 105 km/s, and it takes 1.3 s for light to travel from the Moon to Earth. ... Started by Destiiny22	1 Replies 206 Views	Jul 27, 2018 by vkodali
The Milky Way Galaxy is a. a spiral galaxy. b. part of a cluster of galaxies that contains a few ... Started by newyorker26	1 Replies 164 Views	Jul 27, 2018 by underwood14
Which sequence is correct when ordered by increasing size? a. Earth, Solar System, Milky Way ... Started by sarasara	1 Replies 98 Views	Jul 27, 2018 by HandsomeMarc
If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance ... Started by abern	3 Replies 190 Views	Jul 27, 2018 by dmurph1496
The average distance from Earth to the Sun is a. 1 ly. b. 1 million km. c. 1 million miles. d. ... Started by Starlight	1 Replies 102 Views	Jul 27, 2018 by Chou
Which of these is NOT a common misconception? a. A light year is a unit of time. b. Stars look ... Started by jwb375	1 Replies 167 Views	Jul 27, 2018 by tjayeee
A solar system contains a. primarily planets. b. large amounts of gas and dust but very few ... Started by fagboi	1 Replies 94 Views	Jul 27, 2018 by ErinKing
4.4 106 divided by 8.8 1010 is equal to a. 5.0 105. b. 5.0 104. c. 5.0 104. d. 3.9 1017. ... Started by mckennatimberlake	3 Replies 116 Views	Jul 27, 2018 by CAPTAINAMERICA
Which of the following is the largest? a. the diameter of Earth b. the diameter of the Moon c. ... Started by TVarnum	1 Replies 143 Views	Jul 27, 2018 by 14vl19
Order the following from most recent to least. I. Big Bang II. Age of quasars III. First humans IV. ... Started by Alainaaa8	1 Replies 37 Views	Jul 27, 2018 by nickk12214