Measuring Existential Concerns: new discoveries in 2025-2026

I-Sharing, not exactly existential isolation

At last, something really close to the concept of existential isolation

This study explores the heteroclinic connections linking the stable and unstable manifolds of periodic orbits within the framework of the Sun-Jupiter planar restricted three-body problem.

One of the best books for beginners on qualitative methods. Chapter 9 has an excellent guide on how to apply content analysis.

One of the best guide articles on practical content analysis

Key work on conducting a qualitative study using content analysis

A key work for understanding different types of content analysis.

This study provides comprehensive data on Yarkovsky-driven changes in eccentricity and longitude of periapse. By exploring a broad range of physical and orbital parameters, the results complement the drift rates in semi-major axis previously established by Spitale and Greenberg (2001).

It is shown that the average thermal inertia of a sample of NEAs in the km-size range is 200 ± 40 J m^−2 s^−0.5 K^−1 and it is identified a trend of increasing thermal inertia with decreasing asteroid diameter.

Arecibo radar ranging of NEA 6489 Golevka (diameter ~ 0.5 km) confirms the presence of Yarkovsky-driven orbital drift. This non-gravitational perturbation was isolated by comparing the asteroid's observed trajectory against purely Newtonian dynamical models.

By developing and numerically verifying an analytical model that includes Yarkovsky–Schach and planetary thermal effects, the researchers demonstrated that the Yarkovsky force significantly impacts mutual binary orbits. This orbital evolution occurs specifically in non-synchronous systems, where the spin and orbital periods differ, opening up new possibilities for understanding how binary systems migrate over time.

By developing and numerically verifying an analytical model that includes Yarkovsky–Schach and planetary thermal effects, the researchers demonstrated that the Yarkovsky force significantly impacts mutual binary orbits. This orbital evolution occurs specifically in non-synchronous systems, where the spin and orbital periods differ, opening up new possibilities for understanding how binary systems migrate over time.

By measuring non-gravitational orbital drift, this study identifies the Yarkovsky effect across the NEA population. The reliability of these detections is maintained through a high-precision model—incorporating relativistic terms and the mass of 16 large asteroids—combined with specialized astrometric error treatment.

They used the determined rotation state, shape, size and thermophysical model of Apophis to predict the strength of the Yarkovsky effect in its orbit.

In this paper was investigated the possibility of detecting the Yarkovsky effect via precise orbit determination of near-Earth asteroids.

The study summarizes the knowledge about Yarkovsky, YORP, BYORP effects up to 2015.

A key comprehensive book on self-determination theory. If you don’t want to read all the articles and want a single source, you won’t find a better option.

A chapter in a Personality Psychology book devoted to self-determination theory. An alternative to the “full” version from the 2017 book if you want to save time.

Samples are students and Amazon Turk...

When to choose content analysis, and when — thematic analysis.