User Alex

80 votes

3 answers

20k views

Why didn't the Big Bang create heavy elements?

asked Aug 10, 2015 at 17:31

61 votes

4 answers

8k views

Do solar systems typically spin in the same direction as their galaxy?

angular-momentum astrophysics stars solar-system galaxies

asked Sep 7, 2015 at 17:17

51 votes

3 answers

3k views

Are there tides in the atmosphere?

newtonian-gravity atmospheric-science geophysics tidal-effect

asked Aug 22, 2015 at 20:17

26 votes

1 answer

5k views

Are there naturally occurring lasers?

laser frequency wavelength

asked Aug 22, 2015 at 16:21

26 votes

3 answers

4k views

What is the smallest distance possible between two stars?

astrophysics stars distance binary-stars

asked Jul 31, 2015 at 19:47

24 votes

2 answers

2k views

Is an electron a superconductor?

superconductivity

asked Jul 31, 2015 at 19:10

15 votes

2 answers

4k views

When an atom emits a photon are all directions equally likely?

photons atoms

asked Sep 6, 2015 at 17:10

12 votes

5 answers

5k views

Did the Sun form around a solid core?

astrophysics sun stars stellar-evolution

asked Jul 15, 2015 at 21:28

11 votes

5 answers

6k views

Is Dark Matter expected to be equally distributed in our solar system?

dark-matter

asked Jul 15, 2015 at 0:34

8 votes

2 answers

270 views

Is dark energy homogeneous and/or isotropic?

cosmology dark-energy

asked Jul 29, 2015 at 21:07

6 votes

2 answers

506 views

What is the most common form of antimatter in the universe?

antimatter

asked Jul 21, 2015 at 1:13

6 votes

3 answers

2k views

Why is night vision lacking color?

optics visible-light electromagnetic-radiation

asked Sep 6, 2015 at 0:17

5 votes

0 answers

159 views

What happens to the observed thermal energy of objects at relativistic speeds?

thermodynamics special-relativity

asked Aug 5, 2015 at 19:45

5 votes

3 answers

1k views

Is every electron in the Universe in a different quantum state?

pauli-exclusion-principle

asked Aug 6, 2015 at 5:34

5 votes

3 answers

3k views

What is the binding energy of a neutron star?

homework-and-exercises general-relativity gravity neutron-stars binding-energy

asked Jul 25, 2015 at 20:17

4 votes

2 answers

19k views

How many atoms are there in our solar system?

homework-and-exercises atoms solar-system estimation

asked Jul 22, 2015 at 22:25

4 votes

2 answers

1k views

Are Cosmic Rays net neutral in charge?

charge cosmic-rays

asked Jul 13, 2015 at 2:12

4 votes

1 answer

99 views

When will galaxies become unstable due to dark energy?

galaxies dark-energy

asked Aug 20, 2015 at 0:08

3 votes

3 answers

210 views

Are there more photons than nuclei within the Sun?

photons nuclear-physics astrophysics sun stellar-physics

asked Aug 16, 2015 at 21:26

3 votes

1 answer

485 views

Does the Earth's magnetic field sort cosmic rays by charge?

magnetic-fields earth cosmic-rays

asked Sep 4, 2015 at 18:58

3 votes

1 answer

79 views

How does space expansion affect cosmic rays?

cosmology space-expansion cosmic-rays

asked Aug 26, 2015 at 17:56

3 votes

1 answer

373 views

How do neutrons escape nuclei?

neutrons weak-interaction

asked Jul 24, 2015 at 1:34

3 votes

1 answer

2k views

How can the orbit of Jupiter's moons be used to calculate the speed of light? [duplicate]

speed-of-light measurements jupiter

asked Jul 24, 2015 at 23:50

3 votes

4 answers

1k views

How is relativity related to anti-particles? [duplicate]

special-relativity antimatter

asked Jul 27, 2015 at 3:45

3 votes

2 answers

178 views

Do gamma ray bursts play a role in cosmic evolution?

cosmology astrophysics stars galaxies gamma-rays

asked Jul 28, 2015 at 5:09

2 votes

3 answers

583 views

What is the binding energy of a black hole?

black-holes hawking-radiation binding-energy

asked Jul 27, 2015 at 22:45

2 votes

1 answer

76 views

Are there any other pairs similar to virtual and normal photons? [duplicate]

virtual-particles

asked Jul 30, 2015 at 16:51

2 votes

0 answers

56 views

Do we expect to find a dark energy boson?

dark-energy bosons

asked Jul 24, 2015 at 18:21

2 votes

2 answers

2k views

If the ionosphere reflects radio waves then why use satellites? [closed]

satellites radio

asked Jul 13, 2015 at 3:59

2 votes

1 answer

2k views

Quantum efficiency of Photoelectric effect

photoelectric-effect

asked Jul 12, 2015 at 4:53

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68 Questions

Why didn't the Big Bang create heavy elements?

Do solar systems typically spin in the same direction as their galaxy?

Are there tides in the atmosphere?

Are there naturally occurring lasers?

What is the smallest distance possible between two stars?

Is an electron a superconductor?

When an atom emits a photon are all directions equally likely?

Did the Sun form around a solid core?

Is Dark Matter expected to be equally distributed in our solar system?

Is dark energy homogeneous and/or isotropic?

What is the most common form of antimatter in the universe?

Why is night vision lacking color?

What happens to the observed thermal energy of objects at relativistic speeds?

Is every electron in the Universe in a different quantum state?

What is the binding energy of a neutron star?

How many atoms are there in our solar system?

Are Cosmic Rays net neutral in charge?

When will galaxies become unstable due to dark energy?

Are there more photons than nuclei within the Sun?

Does the Earth's magnetic field sort cosmic rays by charge?

How does space expansion affect cosmic rays?

How do neutrons escape nuclei?

How can the orbit of Jupiter's moons be used to calculate the speed of light? [duplicate]

How is relativity related to anti-particles? [duplicate]

Do gamma ray bursts play a role in cosmic evolution?

What is the binding energy of a black hole?

Are there any other pairs similar to virtual and normal photons? [duplicate]

Do we expect to find a dark energy boson?

If the ionosphere reflects radio waves then why use satellites? [closed]

Quantum efficiency of Photoelectric effect