What powers Cepheid variable stars? What about Mira variables and pulsating stars? And are there variable stars that don’t actually vary at all?

The post Aug 19th: How Do Variable Stars, You Know, Vary? appeared first on 365 Days of Astronomy.

What would the Sun sound like if we could hear it? Does any noise at all happen in the universe? What’s the biggest sound of all?

The post Aug 5th: What Does Outer Space Sound Like? appeared first on 365 Days of Astronomy.

Why does the vacuum of spacetime have energy? How much energy does it have? What prevents us from using it to do anything useful?

The post Jul 22nd: Why Can’t We Get Free Energy from the Vacuum? appeared first on 365 Days of Astronomy.

How do we actually define voids? Are there regions within them that are truly empty? What would it be like to be inside one?

The post Jul 8th: Are the Cosmic Voids Really Empty? appeared first on 365 Days of Astronomy.

What are the modern constants of nature? Is the universe fine-tuned for life? Does the multiverse or string theory explain the origins of the constants?

The post Jun 17th: Where Do the Constants of Nature Come From? Part 2 appeared first on 365 Days of Astronomy.

How do fundamental constants appear in physics? Why are they so important? Why do we care where they come from?

The post Jun 3rd: Where Do the Constants of Nature Come From? Part 1 appeared first on 365 Days of Astronomy.

What’s inside a neutron star? What strange states of matter do we encounter? And what mysteries will we find deep in the core?

The post May 20th: What’s Going On Inside Neutron Stars? appeared first on 365 Days of Astronomy.

How do we explain the giant black holes appearing in the young universe? Is it possible to directly collapse a black hole, skipping the formation of stars? What does ultraviolet radiation have to do with this?

The post May 6th: Is There Any Other Way to Make Black Holes? appeared first on 365 Days of Astronomy.

How do you measure the impact of a scientist? Does Stephen Hawking compare to Newton or Einstein? What were his contributions to black holes, the big bang, and quantum gravity? 

The post Apr 22nd: What is Stephen Hawking’s Legacy? appeared first on 365 Days of Astronomy.

Why is the moon so special? Why do we think a giant impact created it? Why didn’t the same thing happen to other planets? I discuss these questions and more in today’s Ask a Spaceman!

The post Apr 8th: What Made the Moon? appeared first on 365 Days of Astronomy.