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Abanob Ebrahim
  • Member for 8 years, 11 months
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25 votes
4 answers
6k views

Why does the speed of sound decrease at high altitudes although the air density decreases?

23 votes
4 answers
21k views

Explanation for negative specific heat capacities in stars?

16 votes
2 answers
6k views

If atoms never "physically" touch each other, then how does matter-antimatter annihilation happen?

14 votes
1 answer
3k views

What is the percentage of stars that are massive enough to end their lives in a supernova?

14 votes
1 answer
4k views

Are the electrons at the centre of the Sun degenerate or not?

12 votes
2 answers
1k views

Where did the energy released due to gravitational binding energy of the Earth go?

11 votes
2 answers
489 views

Would a rocky planet orbiting so close to a very hot star eventually vaporize?

10 votes
1 answer
760 views

Does matter found at densities of white dwarfs "feel" more like a solid, liquid or gas?

10 votes
4 answers
5k views

What is the actual energy content of the Sun?

8 votes
2 answers
13k views

What is the luminosity of the Milky Way galaxy?

8 votes
2 answers
4k views

How much of a galaxy's mass is in stars?

8 votes
5 answers
9k views

What causes damage, kinetic energy or momentum?

8 votes
5 answers
9k views

Kinetic energy vs. momentum?

8 votes
1 answer
845 views

Would matter-antimatter annihilation create a fireball or not?

7 votes
2 answers
1k views

What is the percentage of useful energy do we get from matter-antimatter annihilation?

7 votes
2 answers
2k views

Can the Sun's core be treated as an ideal gas?

7 votes
1 answer
1k views

How could this small nuclear reactor power two jet engines?

6 votes
2 answers
745 views

How much of the Solar convection zone is completely ionized?

6 votes
3 answers
3k views

What does this stellar mass distribution mean?

6 votes
2 answers
1k views

How much faster is the fusion we make on earth compared to the fusion that happens in the sun?

6 votes
1 answer
2k views

How to calculate the kinetic energy of supernova ejecta?

6 votes
3 answers
547 views

How would normal matter behave under conditions found in the core of the sun?

5 votes
1 answer
356 views

What does a supernova look like at its peak luminosity?

5 votes
1 answer
2k views

Gravitational binding energy of a white dwarf at Chandrasekhar limit?

5 votes
2 answers
2k views

What is the area of the sky that is covered by the Hubble Ultra Deep Field image?

5 votes
1 answer
412 views

According to the initial mass function, should there be more brown dwarfs than red dwarfs?

5 votes
1 answer
957 views

Why do neutron stars have solid crusts?

4 votes
2 answers
998 views

Did Usain Bolt really sustain 11 horsepower of exerted power during the 100 m sprint?

4 votes
1 answer
175 views

Is a rocket engine most efficient when its velocity is equal to the exhaust velocity?

4 votes
2 answers
2k views

What is the main thermal energy source for a protostar, the contraction or the deuterium burning energy?