Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution

نویسندگان

چکیده

On asteroids, fractures develop due to stresses driven by diurnal temperature variations at spatial scales ranging from sub-millimetres metres. However, the timescales of such rock fracturing thermal fatigue are poorly constrained observations. Here we analyse images asteroid (101955) Bennu obtained Origins, Spectral Interpretation, Resource Identification and Security-Regolith Explorer (OSIRIS-REx) mission show that metre-scale on boulders exposed surface have a preferential meridional orientation, consistent with cracking induced variations. Using an analytical model fracture propagation, suggest length those Bennu’s can be produced in 104–105 years. This is comparable or shorter timescale than mass movement processes act expose fresh surfaces reorient any direction signature. We propose boulder happens rapidly compared lifetime near-Earth space other carbonaceous asteroids. The damage this space-weathering process has consequences for material properties these implications preservation primordial signature acquired during accretional phases protoplanetary disk our solar system. Fractures imaged OSIRIS-REx spacecraft over geologically rapid timescales.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Boulders on asteroid Toutatis as observed by Chang’e-2

Boulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution and collisional history of the parent bodies. Using images acquired by the Chang'e-2 spacecraft, more than 200 boulders have been identified over the imaged area of the near-Earth asteroid Toutatis. The cumulative bou...

متن کامل

effect of oral presentation on development of l2 learners grammar

this experimental study has been conducted to test the effect of oral presentation on the development of l2 learners grammar. but this oral presentation is not merely a deductive instruction of grammatical points, in this presentation two hypotheses of krashen (input and low filter hypotheses), stevicks viewpoints on grammar explanation and correction and widdowsons opinion on limited use of l1...

15 صفحه اول

formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)

abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...

15 صفحه اول

the effect of consciousness raising of sociolinguistic skills on speaking ability of iranian efl learners

abstract the main purpose of this study was to investigate whether there was any significant difference between the speaking achievement of learners who were trained by means of consciousness raising of sociolinguistic skills and that of learners who were trained without the above mentioned task. the participants of this study consist of 60 intermediate level students participating languag...

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Nature Geoscience

سال: 2022

ISSN: ['1752-0894', '1752-0908']

DOI: https://doi.org/10.1038/s41561-022-00940-3