Learning and becoming are understood as emergent from participation in practices at the intersection of formal and informal science education. What learners value, engage in, and transform is understood as entangled with who they have been, think they are, and yet aim to become, calling for an intersectional lens to any analysis of learning and identity in science. Who one is and can become in science, given recognition by others as a science person, is political and a product of intersecting patterns of racism and sexism, to name two key dimensions, which are not additive but instead form a symbiotic relationship. Intersectionality foregrounds the structural, political, and representational of an oppressive system at work and is a lens essential to an equity- and social justice–driven conceptualization of science education at the intersection of formal and informal educational venues. Critical transdisciplinarity facilitates the unpacking of what science is and what kind of science a science person engages in, and it can move studies beyond paralyzing ideologies and meritocracies that undermine full participation in science by youth of color, for instance. Engagement with intersectionality, critical transdisciplinarity, and the political can make rightful presence a shared goal to work toward among science educators and researchers, a much-needed commitment in the informal science education field. Community-based educational spaces (CBES) challenge deficit discourses of youth and, instead, aim to build on youths’ funds of knowledge and identities through empowering practices. Identity work is approached through a grounding in practice theory, which calls for a focus on the figuring of worlds, lives, and identities. Becoming somebody in science is presented as a creative act by youth, who challenge what science is and who can become somebody in science. Actions by youth can make evident desirable identities that result in the “thickening” of their affinities with science, a process also charged by emotions. That is, intersectionality can be experienced as emotionally taxing, while agency and transformation by youth may result in positive emotions. A mobile view of learning and identity in science, captured by the notion of wayfinding, calls to attention hybridity, intersectionality, and critical transdisciplinarity. That grounding can move the study of learning and becoming in science beyond a binary vision of formal and informal science education while also making it political. A deeper commitment and engagement with social justice work in studies of learning and identity in CBES, a process well captured by the notion of rightful presence, could become a common goal to work toward in the vast field of science education, both formal and informal.