AstrotalkUK

Not for profit website/blog on astronomy, space and my writing

Episode 121 – Failed stars or successful planets?

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This episode was recorded at the Mount Teide Observatory with Jerry Zhang, a final year PhD student under the supervision of  Professor Eduardo L Martín and Dr Nicolas Lodieu at the Instituto de Astrofísica de Canarias. This class of object had been predicted for a long time but was first detected in 1995 from an observation conducted at the Mount Teide Observatory by a team of observers, including Jerry’s supervisor, Eduardo L Martín.

Jerry’s research focuses on Brown Dwarfs. Astronomical objects are somewhere in between stars and planets. Typically, their size is that of Jupiter, around 150,000km and a mass of between 15 and 70 times that of Jupiter. With such low mass (less than 0.08 of our sun), they can never reach the temperature or pressure in their cores necessary for nuclear fusion. They can never shine like our sun. They remain dim and small (brown and dwarf) throughout their lifetime.

Jerry’s most recent publication, arising from his Phd research, records the first detection of methane in an extreme metal-poor T dwarf.

Listen or download (click the three dots)

Pleiades cluster where Teide-1 was discovered in 1995. Credit: Author using Seestar S50
Pleiades cluster where Teide-1 was discovered in 1995.
Credit: Author using Seestar S50

Episode 120: Prof. Gengxin Xie. A Greenhouse on the Moon

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Chang’e 4. Credit Prof. Xei Gengxin

On Thursday, 3rd January 2019, some water was added to some seeds in a tiny greenhouse. The seeds, cotton, potato, Rape and Arabidopsis sprouted. 

Experiments like this have been conducted many times before. What was special about this one was that it was done on the surface of the Moon.

The guest on this episode is Professor Xie Gengxin from Chongqing University in central China. He was the  Chief Designer of this Bio experiment carried to the Moon on Chang’e 4 in January 2019. The interview was recorded in Milan during the International Astronautical Congress 2024.

In summary

  • The Chang’e 4 lunar mission by China landed on the far side of the moon and conducted a unique biological experiment involving cotton, potato, rape, and Arabidopsis seeds, along with fruit fly eggs and yeast, within a small, sealed greenhouse.
  • The primary goal of the experiment was to determine if plants could germinate and grow on the moon despite the lower gravity, lack of atmosphere, intense sunlight and radiation, and extreme temperature variations.
  • Cotton seeds successfully germinated 22 hours after water was added, marking the first instance of plant growth on the moon. These lunar seedlings grew faster than their counterparts in a control experiment on Earth and showed surprising resilience to the cold lunar night.
  • The experiment’s design included features like passive insulation, active temperature control, a small window for natural sunlight, and anti-fogging technology for the cameras monitoring the growth.
  • The findings suggest that lower gravity and higher radiation might have aided plant growth, and the experiment provided valuable insights and led to the development of technologies relevant to future space-based agriculture and the establishment of lunar habitats.
  • This biological experiment is considered a significant step in China’s lunar exploration program, which includes plans for a future lunar base (the International Lunar Research Station) and further research into creating sustainable ecosystems in space, potentially within lunar lava tubes.
Episode 120. A Greenhouse on the Moon.

Visit to Mount Teide Observatory

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Teide Observatory. Instituto de Astrofísica de Canarias. Tenerife 1st April 2025.
An astronomical centre of excellence in the Northern Hemisphere
The Instituto de Astrofísica de Canarias (IAC), recognized by the Spanish government as a “Severo Ochoa Centre of Excellence”, is a nationally funded research centre that runs two of the best international observatories in the world.

I visited with Jerry Zhang, who is completing his Phd on the topic of Brown Dwarfs. Podcast coming soon.

Where is the Teide Observatory ? Check out this very short Google Earth video.

Some pictures

Partial Solar Eclipse 29 March 2025

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Early on Saturday, 29 March 2024, the clouds cleared and a partial solar eclipse was visible in the sky from Puerto De La Cruz in Tenerife. Surprisingly, it was the first clear day and sunny for almost a week.

The sunspot activity was not particularly high, despite the fact that, right now, the sun is going through a maxima in its 11 year cycle. For comparison, I have included a picture of the sun from December last year. Note the increased amounts of sunspots compared with those seen during today’s partial solar eclipse.

A brief time-lapse video

Here is one from last year