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StarDateYour guide to the universe Author: Billy Henry
StarDate, the longest-running national radio science feature in the U.S., tells listeners what to look for in the night sky. Language: en-us Genres: Astronomy, Education, Science Contact email: Get it Feed URL: Get it iTunes ID: Get it |
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Moon and Antares
Saturday, 4 April, 2026
If we could send a spacecraft to the supergiant star Antares, it could take a really close look. In fact, it’s not hard to imagine that we could build a probe that could safely plunge into the star’s outer layers. Although those layers are hot, they’re also quite thin – a fairly decent vacuum. So a probe might be able to descend millions of miles below the surface and survive. Antares is a monster. It’s roughly a dozen times the mass of the Sun, and 700 times the Sun’s diameter. So its average density is less than one-billionth of the Sun’s. And most of its mass is concentrated deep in the core, which is where the star generates its energy. That means the outer layers are extremely thin – so thin that it’s tough to define the surface – it blends into the background. The surface temperature of Antares is about 6100 degrees Fahrenheit, compared to 10 thousand degrees for the Sun. We’ve already built a probe that can approach to within a few million miles of the Sun. It has a shield that can withstand temperatures of about 2500 degrees. A plunge into Antares would be hotter, but building a shield to take the heat doesn’t seem impossible – providing a way to get an up-close look at this monster star. Antares climbs into good view by 1 or 1:30 a.m. It’s close to the lower left of the Moon as they rise, with the Moon inching closer to the star before dawn. Script by Damond Benningfield
